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DS4550E

Description
I2C and JTAG Nonvolatile 9-Bit I/O Expander Plus Memory
File Size632KB，18 Pages
ManufacturerDALLAS
Websitehttp://www.dalsemi.com
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I2C and JTAG Nonvolatile 9-Bit I/O Expander Plus Memory

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Rev 0; 9/04
I
2
C and JTAG Nonvolatile 9-Bit I/O
Expander Plus Memory
General Description
The DS4550 is a 9-bit, nonvolatile (NV) I/O expander
with 64 bytes of NV user memory controlled by either
an I
2
C
TM
-compatible serial interface or an IEEE 1149.1
JTAG port. The DS4550 offers a digitally programmable
alternative to hardware jumpers and mechanical
switches that are being used to control digital logic
nodes. Each I/O pin is independently configurable. The
outputs are open drain with selectable pullups. Each
output has the ability to sink up to 16mA, and since the
device is NV, it powers up in the desired state allowing
it to control digital logic inputs immediately on power-
up without having to wait for the host CPU to initiate
control.
Features
♦
Programmable Replacement for Mechanical
Jumpers and Switches
♦
Nine NV Inputs/Outputs
♦
64-Byte NV User Memory (EEPROM)
♦
I
2
C-Compatible Serial Interface and JTAG
♦
Up to 8 Devices can be Multidropped on the Same
I
2
C Bus
♦
IEEE 1149.1 Boundary Scan Compliant
♦
Open-Drain Outputs with Configurable Pullups
♦
Outputs Capable of Sinking 16mA
♦
Low Power Consumption
♦
Wide Operating Voltage Range: 2.7V to 5.5V
♦
Operating Temperature Range: -40°C to +85°C
DS4550
Applications
RAM-Based FPGA Bank Switching for Multiple
Profiles
Selecting Between Boot Flash
Setting ASIC Configurations/Profiles
Servers
Network Storage
Routers
Telecom Equipment
PC Peripherals
Ordering Information
PART
DS4550E
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
Add “/T&R” for tape and reel orders.
Pin Configuration
TOP VIEW
V
CC
Typical Operating Circuit
I/O_0 1
I/O_1 2
I/O_2 3
I/O_3 4
I/O_4 5
A0 6
A1 7
TCK 8
TMS 9
V
CC
10
20 GND
19 I/O_8
18 I/O_7
17 I/O_6
16 I/O_5
4.7k
0.1µF
V
CC
A0
A1
A2
GND
SCL
SDA
TCK
TMS
TDI
TDO
DS4550
I/O_0
I/O_1
I/O_2
I/O_3
I/O_4
I/O_5
I/O_6
I/O_7
I/O_8
FPGA
CLOCK
GENERATOR
CPU SPEED
SELECT
DS4550
15 A2
14 TDO
13 TDI
12 SCL
11 SDA
I
2
C
INTERFACE
JTAG
INTERFACE
TSSOP
I
2
C is a trademark of Philips Corp. Purchase of I
2
C components from Maxim Integrated Products, Inc., or one of its sublicensed
Associated Companies, conveys a license under the Philips I
2
C Patent Rights to use these components in an I
2
C system, provided
that the system conforms to the I
2
C Standard Specification as defined by Philips.
______________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
I
2
C and JTAG Nonvolatile 9-Bit I/O
Expander Plus Memory
DS4550
ABSOLUTE MAXIMUM RATINGS
Voltage on V
CC
, SDA, and SCL Pins
Relative to Ground.............................................-0.5V to +6.0V
Voltage on A0, A1, A2, TCK, TMS, TDI, and I/O_n [n = 0 to 8]
Relative to Ground ...................................-0.5V to V
CC
+ 0.5V,
not to exceed +6.0V.
Operating Temperature Range ...........................-40°C to +85°C
EEPROM Programming Temperature Range .........0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature .....................See IPC/JEDEC J-STD-020
Specification
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40°C to +85°C)
PARAMETER
Supply Voltage
Input Logic 1
Input Logic 0
SYMBOL
V
CC
V
IH
V
IL
(Note 1)
CONDITIONS
MIN
+2.7
0.7 x
V
CC
-0.3
TYP
MAX
+5.5
V
CC
+
0.3
0.3 x
V
CC
UNITS
V
V
V
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted.)
PARAMETER
Standby Current
Input Leakage
Input Current each I/O pin
Low-Level Output Voltage (SDA)
I/O Pins Low-Level Output
Voltage
Low-Level Output Voltage (TDO)
High-Level Output Voltage (TDO)
I/O Pin Pullup Resistors
TMS, TDI Pullup Resistors
I/O Capacitance
Power-On Reset Voltage
SYMBOL
I
STBY
I
L
I
I/O
V
OL SDA
V
OL I/O
V
OL TDO
V
OH TDO
R
PU
R
JPU
C
I/O
V
POR
(Note 3)
1.6
0.4 < V
I/O
< 0.9 x V
CC
3mA sink current
6mA sink current
16mA sink current
4mA sink current
1mA source current
2.4
4.0
7.5
5.5
10
7.5
12.5
10
(Note 2)
-1.0
-1.0
CONDITIONS
MIN
TYP
2
MAX
10
+1.0
+1.0
0.4
0.6
0.4
0.4
UNITS
µA
µA
µA
V
V
V
V
kΩ
kΩ
pF
V
2
_____________________________________________________________________
I
2
C and JTAG Nonvolatile 9-Bit I/O
Expander Plus Memory
DS4550
AC ELECTRICAL CHARACTERISTICS-–I
2
C Interface (See
Figure
5)
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Timing referenced to V
IL(MAX)
and V
IH(MIN)
.)
PARAMETER
SCL Clock Frequency
Bus Free Time Between Stop and
Start Conditions
Hold Time (Repeated) Start
Condition
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
Start Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
Stop Setup Time
SDA and SCL Capacitive
Loading
EEPROM Write Time
SYMBOL
f
SCL
t
BUF
t
HD:STA
t
LOW
t
HIGH
t
HD:DAT
t
SU:DAT
t
SU:STA
t
R
t
F
t
SU:STO
C
B
t
WR
(Note 6)
I
2
C EEPROM write (Note 7)
10
(Note 6)
(Note 6)
(Note 5)
(Note 4)
CONDITIONS
MIN
0
1.3
0.6
1.3
0.6
0
100
0.6
20 +
0.1C
B
20 +
0.1C
B
0.6
400
20
300
300
0.9
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
µs
ns
µs
ns
ns
µs
pF
ms
AC ELECTRICAL CHARACTERISTICSJTAG Interface (See
Figure
1)
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted.)
PARAMETER
TCK Clock Period
TCK Clock High/Low Time
TCK to TDI, TMS Setup Time
TCK to TDI, TMS Hold Time
TCK to TDO Delay
TCK to TDO High-Z Delay
EEPROM Write Time
SYMBOL
t
1
t
2
, t
3
t
4
t
5
t
6
t
7
t
WR
JTAG EEPROM write (Note 9)
10
(Note 8)
50
15
10
50
50
20
CONDITIONS
MIN
TYP
1000
500
MAX
UNITS
ns
ns
ns
ns
ns
ns
ms
_____________________________________________________________________
3
I
2
C and JTAG Nonvolatile 9-Bit I/O
Expander Plus Memory
DS4550
NONVOLATILE MEMORY CHARACTERISTICS
(V
CC
= +2.7V to +5.5V, unless otherwise noted.)
PARAMETER
EEPROM Writes
SYMBOL
+70°C (Note 3)
CONDITIONS
MIN
50,000
TYP
MAX
UNITS
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
All voltages referenced to ground.
I
STBY
is specified with SDA = SCL = TMS = TDI = V
CC
, outputs floating, and inputs connected to V
CC
or GND.
Guaranteed by design.
Timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with I
2
C standard mode timing.
After this period, the first clock pulse is generated.
C
B
total
capacitance of one bus line in picofarads.
EEPROM write time applies to all the EEPROM memory and SRAM-shadowed EEPROM memory when SEE = 0. The
EEPROM write time begins after a stop condition occurs.
Note 8:
TCK can be stopped either high or low.
Note 9:
EEPROM write begins immediately after the UPDATE-DR state that latches the data to be written. The EEPROM cannot be
accessed until the EEPROM write has completed. However, the remainder of the JTAG functionality is active and accessi-
ble during the EEPROM write.
t
1
t
2
t
3
TCK
t
4
t
5
TDI, TMS
t
6
t
7
TDO
Figure
1. JTAG Timing Diagram
4
_____________________________________________________________________
I
2
C and JTAG Nonvolatile 9-Bit I/O
Expander Plus Memory
DS4550
Typical Operating Characteristics
(V
CC
= +5.0V, T
A
= +25°C; TDI, TDO, TMS pins are no connects, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
DS4550 toc01
SUPPLY CURRENT
vs. TEMPERATURE
I/O0-I/O7 CONTROL BITS = 0
I/O0-I/O7 PULLUPS DISABLED
DS4550 toc02
SUPPLY CURRENT
vs. SCL FREQUENCY
18
16
SUPPLY CURRENT (µA)
14
12
10
8
6
4
2
V
CC
= SDA = TCK = 2.7V
0
100
200
300
400
V
CC
= SDA = TCK = 5.0V
DS4550 toc03
2
I/O0-I/O7 CONTROL BITS = 0
I/O0-I/O7 PULLUPS DISABLED
V
CC
= SDA = SCL = TCK
SUPPLY CURRENT (µA)
1.5
2.5
20
2
SUPPLY CURRENT (µA)
1.5
V
CC
= SDA = SCL = 5.5V = TCK
1
1
0.5
0.5
V
CC
= SDA = SCL = 2.7V = TCK
0
2.5
3
3.5
4
4.5
5
5.5
SUPPLY VOLTAGE (V)
0
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
0
SCL FREQUENCY (kHz)
SUPPLY CURRENT
vs. TCK FREQUENCY
DS4550 toc04
I/O OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
5
I/O OUTPUT VOLTAGE (V)
4
3
2
1
0
EEPROM RECALL AT V
POR
PULL-UPS ENABLED
PULL-DOWNS DISABLED
DS4550 toc05
25
SDA = SCL = V
CC
20
SUPPLY CURRENT (µA)
15
V
CC
= 5.0V
10
V
CC
= 2.7V
HIGH IMPEDANCE
5
0
0
250 500 750 1000 1250 1500 1750 2000
TCK FREQUENCY (kHz)
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
_____________________________________________________________________
5
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DS4550E DS4550
Description I2C and JTAG Nonvolatile 9-Bit I/O Expander Plus Memory I2C and JTAG Nonvolatile 9-Bit I/O Expander Plus Memory

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