PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Transceivers
Features
Common Features
• PI74FCT16245T and PI74FCT162245T are high-speed, low-
power devices with high-current drive
• V
CC
= 5V ±10%
• Hysteresis on all inputs
• Packaging (Pb-free & Green available):
– 48-pin 240-mil wide plastic TSSOP (A)
– 48-pin 300-mil wide plastic SSOP (V)
PI74FCT16245T Features
• High output drive: I
OH
= –32mA; I
OL
= 64mA
• Power off disable outputs permit “live insertion”
• Typical V
OLP
(Output Ground Bounce)
< 1.0V at V
CC
= 5V, T
A
= 25°C
PI74FCT162245T Features
• Balanced output drivers: ±24mA
• Reduced system switching noise
• Typical V
OLP
(Output Ground Bounce)
< 0.6V at V
CC
= 5V, T
A
= 25°C
Description
Pericom Semiconductor’s PI74FCT16245T and PI74FCT162245T
are 16-bit bidirectional transceivers 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 Ouput 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 Hi-Z condition.
The PI74FCT16245T output buffers are designed with a power off
disable allowing “live insertion” of boards when used as backplane
drivers.
The PI74FCT162245T has ±24mA balanced output drivers. It is
designed with current limiting resistors at its outputs to control the
output edge rate resulting in lower ground bounce and undershoot.
This eliminates the need for external terminating resistors for most
interface applications.
Block Diagram
1
DIR
1
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
7
2
B
7
2
A
6
2
B
6
2
A
5
2
B
5
2
A
4
2
B
4
2
A
3
2
B
3
2
A
2
2
B
2
2
A
1
2
B
1
2
A
0
2
B
0
2
DIR
2
OE
1
PS2032G
08/02/05
PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Tranceivers
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 & V
CC
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............................................................................... 120mA
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 con-
ditions 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.
Pin Configuration
1
DIR
1
B
0
1
B
1
Truth Table
Inputs
(1)
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
1
OE
1
A0
1
A
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
X
OE
X
DIR
Outputs
(1)
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
L
L
H
L
H
X
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
Note:
1. H = High Voltage Level, X = Don’t Care,
L = Low Voltage Level, Z = High Impedance
GND
1
B
6
1
B
7
2
B
0
2
B
1
GND
1
A
6
1
A
7
2
A0
2
A
1
Pin Description
Pin Name
X
OE
X
DIR
X
A
X
X
B
X
Description
3-State Enable Inputs (Active LOW)
Direction Control Input
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs
Ground
Power
GND
2
B
2
2
B
3
GND
2
A
2
2
A
3
GND
V
CC
V
CC
2
B
4
2
B
5
V
CC
2
A
4
2
A
5
GND
2
B
6
2
B
7
2
DIR
GND
2
A
6
2
A
7
2
OE
2
PS2032G
08/02/05
PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Tranceivers
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 5.0V
±10%)
Param-
eters
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
I
OS
I
O
V
H
Description
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance
Output Current
Clamp Diode Voltage
Short Circuit Current
Output Drive Current
Input Hysteresis
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
Standard Input, V
CC
= Max.
Standard I/O, V
CC
= Max.
Standard Input, V
CC
= Min.
Standard I/O, V
CC
= Min.
V
CC
= Max.
V
CC
= Max.
V
CC
= Min., I
IN
= –18mA
V
CC
= Max.
(3)
, V
OUT
= GND
V
CC
= Max.
(3)
, V
OUT
= 2.5V
V
IN
= V
CC
V
IN
= V
CC
V
IN
= GND
V
IN
= GND
V
OUT
= 2.7V
V
OUT
= 0.5V
–0.7
–80
–50
100
–140
Min.
2.0
0.8
1
1
–1
–1
1
–1
–1.2
–300
–180
V
mA
mV
µA
Typ.
(2)
Max.
Units
V
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.
PI74FCT16245T Output Drive Characteristics
(Over the Operating Range)
Parameters
V
OH
V
OL
I
OFF
Description
Output HIGH Voltage
Output LOW Voltage
Power Down Disable
Test Conditions
(1)
I
OH
= –3.0mA
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= 0V, V
IN
or V
OUT
≤ 4.5V
I
OH
= –15.0mA
I
OH
= –32.0mA
I
OL
= 64mA
—
0.2
—
0.55
±100
µA
Min.
2.5
2.4
Typ.
(2)
3.5
3.5
V
Max.
Units
PI74FCT162245T Output Drive Characteristics
(Over the Operating Range)
Parameters
V
OH
V
OL
I
ODL
I
ODH
Description
Output HIGH Voltage
Output LOW Voltage
Output LOW Current
Output HIGH Current
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
= –24.0mA
I
OL
= 24mA
60
–60
Min.
2.4
Typ.
(2)
3.3
0.3
115
–115
0.55
160
–150
Max.
Units
V
mA
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)
3
PS2032G
08/02/05
PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Tranceivers
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
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. This parameter is determined by device characterization but is not production tested.
Power Supply Characteristics
Parameters
I
CC
ΔI
CC
Description
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)
Min.
Typ.
(2)
0.1
0.5
Max.
500
1.5
Units
µA
mA
I
CCD
V
IN
= V
CC,
V
IN
= GND
V
IN
= V
CC,
V
IN
= GND
V
IN
= 3.4V
V
IN
= V
CC,
V
IN
= GND
V
IN
= 3.4V
60
100
µA/
MHz
0.7
2.5
(5)
3.3
(5)
mA
0.9
I
C
Total Power Supply
Current
(6)
2.5
5.5
(5)
17.5
(5)
6.5
Notes:
1. For Max. or Min. conditions, 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 V
CC
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 I
CC
formula. These limits are guaranteed but not tested.
6.
I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
ΔI
CC
D
H
N
T
+ I
CCD
(f
CP
/2 +
f
I
N
I
)
I
CC
=
Quiescent Current
ΔI
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.
4
PS2032G
08/02/05
PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Tranceivers
PI74FCT16245T Switching Characteristics over Operating Range
16245T
Parameters
t
PHL
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
T
SK
(
O
)
16245AT
Com.
Min.
1.5
1.5
1.5
1.5
1.5
—
Max.
4.6
6.2
5.0
6.2
5.0
0.5
16245CT
Com.
Min.
1.5
1.5
1.5
1.5
1.5
—
Max.
4.1
5.8
4.8
5.8
4.8
0.5
ns
ns
ns
ns
ns
ns
Units
Description
Propagation Delay
(2)
A
TO
B, B
TO
A
Output Enable Time
X
OE
to
A
OR
B
Output Disable Time
(3)
X
OE
to
A
OR
B
Output Enable Time
(3)
X
DIR
to
A
OR
B
Output Disable Time
(3)
X
DIR
to
A
OR
B
Output Skew
(4)
Conditions
(1)
Min.
1.5
1.5
C
L
= 50pF
R
L
= 500Ω
1.5
1.5
1.5
—
Com.
Max.
7.0
9.5
7.5
9.5
7.5
0.5
PI74FCT162245T Switching Characteristics over Operating Range
162245T
Parameters
t
PHL
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
tsk(o)
Description
Propagation Delay
(2)
A to B, B to A
Output Enable Time
xOE to A or B
Output Disable Time
(3)
xOE to A or B
Output Enable Time
xDIR to A or B
(3)
Output Disable Time
xDIR to A or B
(3)
Output Skew
(4)
C
L
= 50pF
R
L
= 500Ω
Conditions
(1)
Min.
1.5
1.5
1.5
1.5
1.5
—
Com.
Max.
7.0
9.5
7.5
9.5
7.5
0.5
Min.
1.5
1.5
1.5
1.5
1.5
—
162245AT
Com.
Max.
4.6
6.2
5.0
6.2
5.0
0.5
Min.
1.5
1.5
1.5
1.5
1.5
—
162245CT
Com.
Max.
4.1
5.8
4.8
5.8
4.8
0.5
ns
ns
ns
ns
ns
ns
Units
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.
5
PS2032G
08/02/05
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