Zywyn Corporation
ZT202F/232F/310F/312F
Zywyn
Features
• Meets EIA/TIA-232F and CCITT V.28/V.24 specifications
for V
CC
at +5V ±10%
• Low Quiescent Current – 3mA typ., 5mA max.
• Low Shutdown Current (where applicable) - 1μA typi-
cal, 5μA max.
• Guaranteed High Data Rate 1,000kbps
• Proprietary Switch-Capacitor Regulated Voltage Con-
verters (patent pending)
• Use Small 0.1μF
Capacitors
• Wake Up Feature (where applicable) in Shutdown
Mode
• Tri-State Receiver Outputs
• Latch-up Free
• ESD Protection for RS-232 I/O's
±15kV Human Body Model (HBM)
• Standard Data Rate at 250kbps Available on ZT232E
Series
ZT202F, ZT232F
ZT310F, ZT312F
Low Power 5V 1,000kbps RS232 Transceivers
General Description
The ZT232F series devices are +5V powered EIA/TIA-232 and
CCITT V.28/V.24 communication interfaces with low power re-
quirements. These transceivers consist of two line drivers, two
line receivers and the proprietary switch-capacitor regulated
voltage converters. The ZT310F and ZT312F feature a low power
shutdown mode which draws as little current as 1μA
typical with
receiver outputs tri-stated and in wake-up.
These devices operate
from a single +5V power supply at the guaranteed high data rate
of 1,000k bits/sec with enhanced electrostatic discharge (ESD)
protection in all RS232 I/O pins exceeding ±15kV HBM.
Applications
•
•
•
•
•
•
•
Single Power Supply Applications
Industrial and Embedded PCs
Set Top Boxes
Terminal Adapters
POS terminals
Peripherals Interface
Routers and HUBs
C1+
V+
C1-
C2+
C2-
V-
T
2
OUT
R
2
IN
1
2
3
4
5
6
7
8
16
Vcc
GND
T
1
OUT
R
1
IN
R
1
OUT
T
1
IN
T
2
IN
R
2
OUT
ZYWYN
ZT232F
15
14
13
12
11
10
9
16-pin PDIP/nSOIC/wSOIC/TSSOP
Product Selection Guide And Cross Reference
P a rt
Num ber
ZT202F
ZT232F
ZT310F
ZT312F
# 0f
RS232
Tx
2
2
2
2
# of
RS232
Rx
2
2
2
2
# of Rx
a c tive in
SD
0
0
0
2
# of
TTL
Shut W ake
0 .1 µF
T ri-
Dow n Up
caps
S ta te
4
4
4
4
No
No
Yes
Yes
No
No
No
Yes
No
No
Yes
Yes
D a ta
R a te
(k b p s )
1000
1000
1000
1000
ESD HBM
on
R S 2 3 2 I/O
± 15kV
± 15kV
± 15kV
± 15kV
P in -to -P in
C ro s s
EXAR
N /A
N /A
N /A
N /A
P in -to -P in
C ro s s
M A X IM
N /A
N /A
N /A
N /A
Zywyn
Specifications subject to change without notice
1
Zywyn Corporation • Tel (408) 733-3225 • Fax (408) 733-3206 • Email sales@zywyn.com • www.zywyn.com
June 2010
rev. 04
Zywyn Corporation
Absolute Maximum Ratings
These are stress ratings only and functional operation of the
device at these ratings or any other above those indicated in the
operation sections of the specifications is not implied. Exposure
to absolute maximum rating conditions for extended periods of
time may affect reliability.
Power Supply, (V
CC
) ........................................................–0.3V to +6.0V
V+ ......................................................................................... –0.3V to +7.0V
V– +0.3V to –7.0V
|V+|
+
|V-|
......................................................................................... +13.0V
I
CC
(DC V
CC
or GND current) .......................................................±100mA
Input Voltages
TxIN, SHUTDOWN, EN ....................................................–0.3V to +6.0V
RxIN .........................................................................................................
±25V
Output Voltages
TxOUT ............................................................................................ ±12V
RxOUT....................................................................–0.3V to (V
CC
+0.3V)
Short-Circuit Duration
TxOUT ....................................................................................... Continuous
Operating Temperature ...............................................–40°C to +85°C
Storage Temperature ................................................. –65°C to +150°C
Power Dissipation Per Package
16-pin PDIP (derate 11.20mW/°C above +70°C) ................ 896mW
16-pin nSOIC (derate 10.00mW/°C above +70°C).............. 720mW
16-pin wSOIC (derate 10.10mW/°C above +70°C) ............. 787mW
16-pin SSOP (derate 7.20mW/°C above +70°C) .................. 584mW
16-pin TSSOP (derate 6.80mW/°C above +70°C)................ 556mW
18-pin PDIP (derate 12.60mW/°C above +70°C) ....... 962mW
18-pin wSOIC (derate 11.10mW/°C above +70°C) ............ 850mW
20-pin PDIP (derate 12.80mW/°C above +70°C) .............. 976mW
20-pin SSOP (derate 8.10mW/°C above +70°C) ................ 647mW
20-pin wSOIC (derate 11.10mW/°C above +70°C) .... 850mW
20-pin TSSOP (derate 7.20mW/°C above +70°C)................ 584mW
ZT202F/232F/310F/312F
Storage Considerations
Storage in a low humidity environment is preferred. Large
high density plastic packages are moisture sensitive and
should be stored in Dry Vapor Barrier Bags. Prior to usage,
the parts should remain bagged and stored below 40°C and
60%RH. If the parts are removed from the bag, they should
be used within 168 hours or stored in an environment at or
below 20%RH. If the above conditions cannot be followed,
the parts should be baked for 12 hours at 125°C in order to
remove moisture prior to soldering. Zywyn ships product in
Dry Vapor Barrier Bags with a humidity indicator card and
desiccant pack. The humidity indicator should be below
30%RH. The MSL of this product is 3.
The information furnished by Zywyn has been carefully reviewed
for accuracy and reliability. Its application or use, however, is
solely the responsibility of the user. No responsibility of the use
of this information become part of the terms and conditions of
any subsequent sales agreement with Zywyn. Specifications are
subject to change without the responsibility for any infringement
of patents or other rights of third parties which may result from
its use. No license or proprietary rights are granted by implica-
tion or otherwise under any patent or patent rights of Zywyn
Corporation.
Zywyn
2
Specifications subject to change without notice
June 2010
rev. 04
Zywyn Corporation
Electrical Characteristics
ZT202F/232F/310F/312F
Unless otherwise stated, V
CC
= +5.0V, T
A
= T
min
to T
max
, C1 to C4 = 0.1μF, typical values apply at V
CC
= +5.0V and T
A
= 25°C.
Parameter
TTL Logic Input
TTL Logic Output
RS-232 Input
RS-232 Output
Charge Pump Pin
Power Pin
Charge Pump Caps
Temp 0°C to +70°C
Temp –40°C to +85°C
V
CC
Voltage Range
Supply Current
Quiescent
Supply Current
Transmitters Loaded
Supply Current,
SHUTDOWN Enabled
TTL LOGIC Input
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Leakage Current
TTL LOGIC Output
Output Voltage Low
Output Voltage High
Output Leakage Current
Receiver Input
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
Transmitter Output
R
L
= 3~7kΩ, All Outputs are loaded
(For ZT232F)
R
L
= 3~7kΩ, All Outputs are loaded, V
CC
= 5.25V
(For ZT202F, ZT310F, ZT312F)
Output Resistance
V
CC
= V
DD
= V
SS
= GND, V
OUT
= ±2V
Output Short-Circuit Current V
OUT
= GND
Output Leakage Current
Transmitter Disabled, V
OUT
= ±12V
Output Voltage Swing
±5
±5
300
±6
±9
±20
±5
±60
V
V
Ω
mA
μA
T
A
= T
min
– T
max
T
A
= 25°C, V
CC
= 5.0V
V
CC
= +5.0V Supply
T
A
= 25°C
V
IN
= ±25V, T
A
= 25°C
–25
0.8
0.2
3
25
1.2
1.7
0.5
2.4
1.0
7
V
V
V
V
kΩ
I
OUT
= 3.2mA
I
OUT
= –1.0mA
SHDN = GND, EN = V
CC
; GND < V
OUT
< V
CC
(For ZT310F/ZT312F)
0.4
3.5
0.05
10
V
V
μA
Condition
T
1
IN, T
2
IN, EN, SHDN
R
1
OUT, R
2
OUT
R
1
IN, R
2
IN
T
1
OUT, T
2
OUT
C
1
P, C
1
N, C
2
P, C
2
N
V
CC
, V
GND
, V
DD
, V
SS
C
1
P, C
1
N, C
2
P, C
2
N
Commercial Grade
Industrial Grade
V
CC
= +5.0V Supply
TTL Inputs = V
CC
/GND, RS-232 Input = float, T
A
= 25°C
V
CC
= +5.0V ±10%, No load on transmitter outputs (For ZT232F)
(For ZT202F, ZT310F, ZT312F)
TTL Inputs = V
CC
/GND, RS-232 Inputs = float, T
A
= 25°C
V
CC
= +5.0V, All transmitter outputs loaded with R
L
= 3kΩ
SHDN = GND, TTL Inputs = V
CC
/GND, T
A
= 25°C
RS-232 Inputs = float, V
CC
= +5.0V (For ZT310F/ZT312F)
V
CC
= +5.0V Supply
T
1
IN, T
2
IN, EN, SHDN
T
1
IN, T
2
IN, EN, SHDN
T
1
IN, T
2
IN
T
x
IN = GND
0.8
2.4
0.5
15
200
V
V
V
μA
Min
Typ
Max
Units
see specifications below
0.1
0
–40
4.5
0.1
+25
+25
5
3
4
15
1.0
+70
+85
5.5
5
8
μF
°C
°C
V
mA
mA
mA
1
5
μA
Zywyn
3
Specifications subject to change without notice
June 2010
rev. 04
Zywyn Corporation
Electrical Characteristics
ZT202F/232F/310F/312F
Unless otherwise stated, V
CC
= +5.0V, T
A
= T
min
to T
max
, C1 to C4 = 0.1μF, typical values apply at V
CC
= +5.0V and T
A
= 25°C.
Parameter
Timing Characteristics
Maximum Data Rate
R
L
= 3~7kΩ, C
L
= 50pF~2500pF, T
A
= 25°C
One Transmitter (1Tx/1Rx) Switching
Transition-Region Slew Rate
Transmitter Propagation t
PLH
Transmitter Propagation t
PHL
Tramsmitter Skew
Transmitter Output Enable Time
Transmitter Output Disable Time
Receiver Propagation t
PLH
Receiver Propagation t
PHL
Receiver Skew
Receiver Output Enable Time
Receiver Output Disable Time
ESD Tolerance
RS-232 I/Os
ESD HBM
TTL/CMOS I/Os
ESD HBM
±2
kV
±15
kV
R
L
= 3~7kΩ, C
L
= 50pF~2500pF, One Transmitter Switching,
T
A
= 25°C, Measured from +3V to –3V or –3V to +3V, V
CC
= 4.5V
All transmitters loaded with R
L
= 3kΩ, C
L
= 1000pF
All transmitters loaded with R
L
= 3kΩ, C
L
= 1000pF
t
PHL
- t
PLH
(For ZT310F/ZT312F)
(For ZT310F/ZT312F)
C
L
= 150pF
C
L
= 150pF
t
PHL
- t
PLH
(For ZT310F/ZT312F)
(for ZT310F/ZT312F)
1000
90
2.0
2.0
100
0.4
0.25
0.15
0.15
50
0.2
0.2
kbps
V/μs
μs
μs
ns
μs
μs
μs
μs
ns
μs
μs
Condition
Min
Typ
Max
Units
Table 1. Wake-Up Truth Table for ZT312F
Zywyn
4
Specifications subject to change without notice
June 2010
rev. 04
Zywyn Corporation
Circuit Description
Proprietary Switch-Capacitor Regulated Voltage Con-
verter
Different from other suppliers, Zywyn uses a patent pending
switch-capacitor voltage-controlled source and sink current gen-
erators design to provide powerful bipolar voltages to maintain
compliant EIA/RS232 levels regardless of power supply fluctua-
tions. The design consists of an internal regulated oscillator, a two
phase clock cycling, regulated complementary MOS switches,
fast switching diode and switch capacitors.
The switch capacitor bi-directional current generators operate
with Zywyn’s proprietary smartly regulated complementary MOS
switches and fast switching diode from its proprietary high voltage
process technology. The efficiency of these bi-directional current
generators is well over 70%. The switching frequency is generated
by an internal oscillator and regulated by the current loads. The
switch capacitor pump design delivers higher negative bucked
voltage than the positive boosted voltage to achieve a balanced
voltage controlled source and sink current generators resulting
a balanced bipolar voltage supplies to the chip.
With its unique proprietary design technique, Zywyn’s interface
product series provide a better power efficient, stable and compli-
ant EIA/RS232 levels with superior low power consumption.
ZT202F/232F/310F/312F
effect the serial port and even subject it to transients that could
potentially damage the transceiver itself.
The RS232 transceiver is usually routed from the serial port
connector to the transceiver IC through the metal trace on the
printed circuit board. This trace will have some small amount
of resistance that will add some protection in terms of limiting
transient current to the IC. However for added voltage protec-
tion, transient voltage suppressors (TVS) or transzorbs, which
are back-to-back diode arrays clamp, are usually necessary to
protect the serial port circuity.
To further reduce cost within their system, more engineers are
requiring higher ESD tolerances from the transceiver ICs them-
selves without having to add costly TVS circuitry. Zywyn's RS232
transceivers includes built-in transient voltage suppression where
external ESD circuitry is not necessary to meet the MIL-STD-883,
Method 3015, Human Body Model and the EN61000-4-2 Air/Con-
tact Discharge tests.
The Human Body Model has been the generally accepted ESD
testing method for semiconductors. This test is intended to
simulate the human body’s potential to store electrostatic energy
and discharge it to an integrated circuit upon close proximity or
contact. This method will test the IC’s capability to withstand an
ESD transient during normal handling such as in manufacturing
areas where the ICs tend to be handled frequently.
EN61000-4-2 is used for testing ESD on equipment and systems.
For system manufacturers, they must guarantee a certain amount
of ESD protection since the system itself is exposed to the outside
environment and human presence. EN61000-4-2 specifies that
the system is required to withstand an amount of static electric-
ity when ESD is applied to exposed metal points and surfaces of
the equipment that are accessible to personnel during normal
usage. The transceiver IC receives most of the ESD current when
the ESD source is applied to the connector pins.
There are two methods within EN61000-4-2, the Air Discharge
method and the Contact Discharge method. With the Air Dis-
charge Method, an ESD voltage is applied to the equipment
under test through air, which simulates an electrically charged
person ready to connect a cable onto the rear of the system and
the high energy potential on the person discharges through an
arcing path to the rear panel of the system before he or she even
touches the system. The Contact Discharge Method applies the
ESD current directly to the EUT. This method was devised to reduce
the unpredictability of the ESD arc. The discharge current rise
time is constant since the energy is directly transferred without
the air-gap arc inconsistencies.
Controlled Enable and Power-Down
The ZT310F and ZT312F both feature an enable input, which
allows the receiver outputs to be either tri–stated or enabled.
This can be especially useful when the receiver is tied directly to
a microprocessor data bus. For the ZT310F, enable is active low, in
which a logic HIGH applied to the OFF pin will enable the receiver
outputs. For the ZT310F, enable is active high in which a logic
HIGH applied to the EN pin will enable the receiver outputs.
ZT310F and ZT312F have a low-power shutdown mode controlled
by the ON/OFF pin for the ZT310F and the SHDN pin for the
ZT312F. During shutdown the driver output and the switch-ca-
pacitor regulated voltage converter are disabled with the supply
current falls to less than 1μA.
ZT312F includes a wakeup function that enables both receivers
during a shutdown state. With only the receivers active during
the shutdown state, the devices draw 5-10μA of supply current.
A typical application is when a RS232 cable is connected or when
the peripheral is enabled such as a modem, the devices will au-
tomatically become active again. After the supply voltage to the
ZT312F reaches +5.0V, the SHDN pin can be disabled, taking the
ZT312F out of the shutdown mode. All receivers that are active
during shutdown maintain 500mV (typ.) of hysteresis.
ESD Immunity
Electro-Static Discharge (ESD) is an important factor when imple-
menting a serial port into a system. In some applications, it is
crucial that the ESD protection for the system must meet a certain
tolerance level. Since RS232 transceiver devices are exposed to
the outside world, there are many environmental factors that can
Zywyn
5
Specifications subject to change without notice
June 2010
rev. 04
Microcontroller MCU
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