21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT162Q245T
LOW NOISE 16-BIT BIDIRECTIONAL TRANSCEIVERS
PI74FCT162Q245T
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
Product Features:
• V
CC
= 5V ±10%
• Balanced output drivers:
±12 mA
• Output impedance:
35Ω (typical)
• Typical V
OLP
(Output Ground Bounce) < 0.5V
at V
CC
= 5V, T
A
= 25°C
• Bus Hold retains last active bus state during tri-state
• Hysteresis on all inputs
• Packages available:
– 48-pin 240-mil wide plastic TSSOP (A48)
– 48-pin 300-mil wide plastic SSOP (V48)
– 48-pin 150-mil wide plastic BQSOP (B48)
• Device models available on request
Fast, Low Noise CMOS 16-Bit
Bidirectional Transceivers
Product Description:
Pericom Semiconductor’s PI74FCT series of logic circuits are pro-
duced in the Company’s advanced 0.6 micron CMOS technology,
achieving industry leading speed grades.
The PI74FCT162Q245T is a 16-bit bidirectional transceiver designed
for asynchronous two-way communication between data buses.
The direction control input pin (xDIR) determines the direction of
data flow through the bidirectional transceiver. The Direction and
Output Enable controls are designed to operate these devices as
either two independent 8-bit transceivers or one 16-bit transceiver.
The output enable (OE) input, when HIGH, disables both A and B
ports by placing them in HIGH Z condition.
The PI74FCT162Q245T is designed with current limiting resistors
at its outputs to control the output edge rate resulting in lower
ground bounce and undershoot. This device features a typical
output impedance of 35Ω, eliminating the need for external
terminating resistors for most bus interface applications. This noise
suppression benefit is designated by the letter “Q” (for quiet) in the
part number.
The PI74FCT162Q245T also features “Bus Hold” which retains
the input’s last state whenever the input goes to high-impedance
preventing “floating” inputs and eliminating the need for pullup/
down resistors.
Logic Block Diagram
1
DIR
2
DIR
1
OE
2
OE
1
A
0
1
B
0
1
A
1
1
B
1
1
A
2
1
B
2
1
A
3
1
B
3
1
A
4
1
B
4
1
A
5
1
B
5
1
A
6
1
B
6
1
A
7
1
B
7
2
A
0
2
B
0
2
A
1
2
B
1
2
A
2
2
B
2
2
A
3
2
B
3
2
A
4
2
B
4
2
A
5
2
B
5
2
A
6
2
B
6
2
A
7
2
B
7
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Product Pin Description
Pin Name
xOE
xDIR
xAx
xBx
GND
V
CC
Description
Output Enable Inputs (Active LOW)
Direction Control Input
Side A Inputs or 3-State Outputs
(1)
Side B Inputs or 3-State Outputs
(1)
Ground
Power
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT162Q245T
LOW NOISE 16-BIT BIDIRECTIONAL TRANSCEIVERS
Truth Table
Inputs
(1)
X
OE
L
L
H
xDIR
L
H
X
Outputs
(1)
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
Note:
1. For the PI74FCT162Q245T, these pins have “Bus
Hold.” All other pins are standard, outputs, or I/Os.
Note:
1. H = High Voltage Level
X = Don’t Care
L = Low Voltage Level
Z = High Impedance
Product Pin Configuration
1
DIR
1
B
0
1
B
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
1
OE
1
A
0
1
A
1
GND
1
B
2
1
B
3
GND
1
A
2
1
A
3
V
CC
1
B
4
1
B
5
V
CC
1
A
4
1
A
5
GND
1
B
6
1
B
7
2
B
0
2
B
1
48-PIN
A48
B48
V48
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
GND
1
D
6
1
A
7
2
A
0
2
A
1
GND
2
B
2
2
B
3
GND
2
A
2
2
A
3
V
CC
2
B
5
2
B
5
GND
2
B
6
2
B
7
2
DIR
V
CC
2
A
4
2
A
5
GND
2
A
6
2
A
7
2
OE
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PI74FCT162Q245T
LOW NOISE 16-BIT BIDIRECTIONAL TRANSCEIVERS
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ................................................................. –65°C to +150°C
Ambient Temperature with Power Applied ................................. –40°C to +85°C
Supply Voltage to Ground Potential (Inputs & Vcc Only) .......... –0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ....... –0.5V to +7.0V
DC Input Voltage ......................................................................... –0.5V to +7.0V
DC Output Current ................................................................................... 120 mA
Power Dissipation ......................................................................................... 1.0W
Note:
Stresses greater than those listed under
MAXIMUM RATINGS may cause permanent
damage to the device. This is a stress rating
only and functional operation of the device at
these or any other conditions above those
indicated in the operational sections of this
specification is not implied. Exposure to
absolute maximum rating conditions for
extended periods may affect reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 5.0V ± 10%)
Parameters Description
V
IH
V
IL
I
IH
I
IH
I
IL
I
IL
I
BHH
I
BHL
I
OZH
I
OZL
V
IK
I
O
V
H
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input HIGH Current
Input LOW Current
Input LOW Current
Bus Hold
Sustain Current
High Impedance
Output Current
Clamp Diode Voltage
Output Drive Current
Input Hysteresis
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
Standard Input, V
CC
= Max.
Bus Hold Input
(4)
, V
CC
= Max.
Standard Input, V
CC
= Min.
Bus Hold Input
(4)
, V
CC
= Min.
Bus Hold Input
(4)
, V
CC
= Min.
V
CC
= Max.
V
CC
= Max.
V
CC
= Min., I
IN
= –18 mA
V
CC
= Max.
(3)
, V
OUT
= 2.5V
Min.
2.0
V
IN
= V
CC
V
IN
= V
CC
V
IN
= GND
V
IN
= GND
V
IN
= 2.0V
V
IN
= 0.8V
V
OUT
= V
CC
V
OUT
= GND
0.8
1
±100
–1
±100
–50
+50
1
–1
–1.2
–180
Typ
(2)
Max.
Units
V
V
µA
µA
µA
µA
µA
µA
µA
V
mA
mV
–0.7
–50
100
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. Pins with Bus Hold are identified in the pin description.
5. This specification does not apply to bi-directional functionalities with Bus Hold.
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PS2050A 04/12/96
Output Drive Characteristics
(Over the Operating Range)
Parameters Description
I
ODL
I
ODH
Output LOW Current
Output HIGH Current
Test Conditions
(1)
V
CC
= 5V, V
IN
= V
IH OR
V
IL
, V
OUT
= 1.5V
(3)
V
CC
= 5V, V
IN
= V
IH OR
V
IL
, V
OUT
= 1.5V
(3)
Min.
36
-100
Typ
(2)
—
-166
Max.
—
-200
Units
mA
mA
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PI74FCT162Q245T
LOW NOISE 16-BIT BIDIRECTIONAL TRANSCEIVERS
Output Drive Characteristics
(Over the Operating Range)
Parameters Description
V
OH
V
OL
Output HIGH Voltage
Output LOW Voltage
Test Conditions
(1)
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= –12.0 mA
I
OL
= 12 mA
Min. Typ
(2)
Max. Units
2.4
—
3.3
0.4
—
0.55
V
V
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(4)
C
IN
C
OUT
Description
Input Capacitance
Output Capacitance
Test Conditions
V
IN
= 0V
V
OUT
= 0V
Typ
4.5
5.5
Max.
6
8
Units
pF
pF
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. This parameter is determined by device characterization but is not production tested.
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PS2050A 04/12/96
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PI74FCT162Q245T
LOW NOISE 16-BIT BIDIRECTIONAL TRANSCEIVERS
Power Supply Characteristics
Parameters Description
I
CC
∆I
CC
I
CCD
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
Test Conditions
(1)
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.,
Outputs Open
X
OE = xDIR = GND
One Bit Toggling
50% Duty Cycle
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
One Bit Toggling
V
CC
= Max.,
Outputs Open
f
I
= 2.5 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
16 Bits Toggling
V
IN
= GND or V
CC
V
IN
= 3.4V
(3)
V
IN
= V
CC
V
IN
= GND
Min.
Typ
(2)
0.1
0.5
60
Max.
500
1.5
100
Units
µA
mA
µA/
MHz
I
C
Total Power Supply
Current
(6)
V
IN
= V
CC
V
IN
= GND
0.6
1.5
(5)
mA
V
IN
= 3.4V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
0.9
2.4
2.3
(5)
4.5
(5)
V
IN
= 3.4V
V
IN
= GND
6.4
16.5
(5)
Notes:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
CC
= 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at Vcc or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
∆I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current
∆I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
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