PI74FCT162Q245T
LOW NOISE 16-BIT BIDIRECTIONAL TRANSCEIVERS
290
PS2050A 04/12/96
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Logic Block Diagram
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 35
, 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.
Product Features:
V
CC
= 5V 10%
Balanced output drivers:
12 mA
Output impedance:
35
(typical)
Typical V
OLP
(Output Ground Bounce) < 0.5V
at V
CC
= 5V, T
A
= 25C
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
PI74FCT162Q245T
Fast, Low Noise CMOS 16-Bit
Bidirectional Transceivers
1
B
0
1
A
0
1
OE
1
DIR
1
B
1
1
A
1
1
B
2
1
A
2
1
B
3
1
A
3
1
B
4
1
A
4
1
B
5
1
A
5
1
B
6
1
A
6
1
B
7
1
A
7
2
B
0
2
A
0
2
OE
2
DIR
2
B
1
2
A
1
2
B
2
2
A
2
2
B
3
2
A
3
2
B
4
2
A
4
2
B
5
2
A
5
2
B
6
2
A
6
2
B
7
2
A
7
PI74FCT162Q245T
LOW NOISE 16-BIT BIDIRECTIONAL TRANSCEIVERS
291
PS2050A 04/12/96
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Product Pin Description
Pin Name
Description
xOE
Output Enable Inputs (Active LOW)
xDIR
Direction Control Input
xAx
Side A Inputs or 3-State Outputs
(1)
xBx
Side B Inputs or 3-State Outputs
(1)
GND
Ground
V
CC
Power
Inputs
(1)
X
OE
xDIR
Outputs
(1)
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
High Z State
Truth Table
Note: 1. H = High Voltage Level
X = Don't Care
L = Low Voltage Level
Z = High Impedance
Product Pin Configuration
Note: 1. For the PI74FCT162Q245T, these pins have "Bus
Hold." All other pins are standard, outputs, or I/Os.
1
2
3
4
5
6
7
8
9
48
10
47
11
46
12
45
13
44
14
43
15
42
16
41
17
40
18
39
19
38
20
37
21
36
22
35
23
34
24
33
32
31
30
29
28
27
26
25
1
DIR
1
B
0
1
B
1
GND
1
B
2
1
B
3
V
CC
1
B
4
1
B
5
GND
1
B
6
1
B
7
2
B
0
2
B
1
GND
2
B
2
2
B
3
V
CC
2
B
5
2
B
5
GND
2
B
6
2
B
7
2
DIR
1
OE
1
A
0
1
A
1
GND
1
A
2
1
A
3
V
CC
1
A
4
1
A
5
GND
1
D
6
1
A
7
2
A
0
2
A
1
GND
2
A
2
2
A
3
V
CC
2
A
4
2
A
5
GND
2
A
6
2
A
7
2
OE
48-PIN
A48
B48
V48
PI74FCT162Q245T
LOW NOISE 16-BIT BIDIRECTIONAL TRANSCEIVERS
292
PS2050A 04/12/96
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DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 5.0V 10%)
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.8
V
I
IH
Input HIGH Current
Standard Input, V
CC
= Max.
V
IN
= V
CC
1
A
I
IH
Input HIGH Current
Bus Hold Input
(4)
, V
CC
= Max.
V
IN
= V
CC
100
A
I
IL
Input LOW Current
Standard Input, V
CC
= Min.
V
IN
= GND
1
A
I
IL
Input LOW Current
Bus Hold Input
(4)
, V
CC
= Min.
V
IN
= GND
100
A
I
BHH
Bus Hold
Bus Hold Input
(4)
, V
CC
= Min.
V
IN
= 2.0V
50
A
I
BHL
Sustain Current
V
IN
= 0.8V
+50
I
OZH
High Impedance
V
CC
= Max.
V
OUT
= V
CC
1
A
I
OZL
Output Current
V
CC
= Max.
V
OUT
= GND
1
A
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18 mA
0.7
1.2
V
I
O
Output Drive Current
V
CC
= Max.
(3)
, V
OUT
= 2.5V
50
180
mA
V
H
Input Hysteresis
100
mV
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ................................................................. 65C to +150C
Ambient Temperature with Power Applied ................................. 40C to +85C
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.
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, +25C 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.
PI74FCT162Q245T
LOW NOISE 16-BIT BIDIRECTIONAL TRANSCEIVERS
293
PS2050A 04/12/96
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Output Drive Characteristics
(Over the Operating Range)
Parameters Description
Test Conditions
(1)
Min. Typ
(2)
Max. Units
V
OH
Output HIGH Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= 12.0 mA
2.4
3.3
--
V
V
OL
Output LOW Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 12 mA
--
0.4
0.55
V
Output Drive Characteristics
(Over the Operating Range)
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
I
ODL
Output LOW Current
V
CC
= 5V, V
IN
= V
IH
OR
V
IL
, V
OUT
= 1.5V
(3)
36
--
--
mA
I
ODH
Output HIGH Current
V
CC
= 5V, V
IN
= V
IH
OR
V
IL
, V
OUT
= 1.5V
(3)
-100
-166
-200
mA
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, +25C 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.
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(4)
Description
Test Conditions
Typ
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
4.5
6
pF
C
OUT
Output Capacitance
V
OUT
= 0V
5.5
8
pF
PI74FCT162Q245T
LOW NOISE 16-BIT BIDIRECTIONAL TRANSCEIVERS
294
PS2050A 04/12/96
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Power Supply Characteristics
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
I
CC
Quiescent Power
V
CC
= Max.
V
IN
= GND or V
CC
0.1
500
A
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.4V
(3)
0.5
1.5
mA
Input @ TTL HIGH
I
CCD
Supply Current per
V
CC
= Max.,
V
IN
= V
CC
60
100
A/
Input per MHz
(4)
Outputs Open
V
IN
= GND
MHz
X
OE = xDIR = GND
One Bit Toggling
50% Duty Cycle
I
C
Total Power Supply
V
CC
= Max.,
V
IN
= V
CC
0.6
1.5
(5)
mA
Current
(6)
Outputs Open
V
IN
= GND
f
I
= 10 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
One Bit Toggling
V
IN
= 3.4V
0.9
2.3
(5)
V
IN
= GND
V
CC
= Max.,
V
IN
= V
CC
2.4
4.5
(5)
Outputs Open
V
IN
= GND
f
I
= 2.5 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
16 Bits Toggling
V
IN
= 3.4V
6.4
16.5
(5)
V
IN
= GND
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, +25C 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.
PI74FCT162Q245T
LOW NOISE 16-BIT BIDIRECTIONAL TRANSCEIVERS
295
PS2050A 04/12/96
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Switching Characteristics over Operating Range
162Q245T
162Q245AT
162Q245CT
162Q245DT
162Q245ET
Com.
Com.
Com.
Com.
Com
Parameters
Description
Conditions
(1)
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Unit
t
PLH
Propagation Delay
C
L
= 50 pF
1.5
7.0
1.5
4.6
1.5
4.1
1.5
3.8
1.5
3.2
ns
t
PHL
A to B, B to A
R
L
= 500
t
PZH
Output Enable Time
1.5
9.5
1.5
6.2
1.5
5.8
1.5
5.0
1.5
4.4
ns
t
PZL
X
OE to A or B
t
PHZ
Output Disable Time
(3)
1.5
7.5
1.5
5.0
1.5
4.8
1.5
4.3
1.5
4.0
ns
t
PLZ
xOE to A or B
t
PZH
Output Enable Time
1.5
9.5
1.5
6.2
1.5
5.8
1.5
5.0
1.5
4.8
ns
t
PZL
X
DIR to A or B
(3)
t
PHZ
Output Disable Time
1.5
7.5
1.5
5.0
1.5
4.8
1.5
4.3
1.5
4.0
ns
t
PLZ
xDIR to A or B
(3)
t
SK
(o)
Output Skew
(4)
--
0.5
--
0.5
--
0.5
--
0.5
--
0.5
ns
Notes:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not production tested.
4. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by design.
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
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