21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT245T/640T/645T
PI74FCT2245T/2640T/2645T
(25Ω Series)
Ω
Fast CMOS Octal
Bidirectional Transceivers
Product Features
PI74FCT245/640/645T and PI74FCT2245/2640T/2645T are pin
compatible with bipolar FAST Series at a higher speed and
lower power consumption
25 Ohm series resistor on all outputs (FCT2XXX only)
TTL input and output levels
Low ground bounce outputs
Extremely low static power
Hysteresis on all inputs
Industrial operating temperature range: 40°C to +85°C
Packages available:
20-pin 173 mil wide plastic TSSOP (L)
20-pin 300 mil wide plastic DIP (P)
20-pin 150 mil wide plastic QSOP (Q)
20-pin 150 mil wide plastic TQSOP (R)
20-pin 300 mil wide plastic SOIC (S)
20-pin 209 mil wide plastic SSOP (H)
Device models available on request
Product Description
Pericom Semiconductors PI74FCT series of logic circuits are
produced using the Companys advanced 0.6/0.8 micron CMOS
technology, achieving industry leading speed grades. All
PI74FCT2XXX devices have a built-in 25 Ohm series resistor on all
outputs to reduce noise because of reflections, thus eliminating the
need for an external terminating resistor.
The PI74FCT245T/640T/645T and PI74FCT2245T/2640T/2645T are
8-bit wide octal buffer bidirectional transceivers designed for
asynchronous two-way communication between data buses. The
transmit/receive (T/R) input determines the direction of data flow
through the bidirectional transceiver. Transmit (active HIGH) enables
data from A ports to B ports, and receive (active LOW) from B ports
to A ports. The output enable (OE) input, when HIGH, disables both
A and B ports by placing them in HIGH Z condition.
Product Pin Configuration
T/R
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
GND
1
20
2
19
3
18
4
20-Pin
17
5
L,P,Q
16
6
R,S,H
15
7
14
8
13
9
12
10
11
Logic Block Diagram
T/R
OE
A0
B0
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
Vcc
OE
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
Product Pin Description
Pin Name
OE
T/R
A
0
-A
7
B
0
-B
7
GND
V
CC
Description
3-State Output Enable Inputs (Active LOW)
Transmit/Receive Input
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs
Ground
Power
Truth Table
(1)
Inputs
OE
T/R
L
L
L
H
H
X
1.
2.
1
Outputs
Bus B Data to Bus A
(2)
Bus A Data to Bus B
(2)
High Z State
FCT245, 2245, 645, 2645 are non-inverting options.
FCT640 & FCT2640 are inverting options.
H = High Voltage Level, X = Don't Care, L = Low
Voltage Level, Z = High Impedance
640 is inverting from input to output.
PS2012B
09/22/99
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT245T/640T/645T
25 Ohm Series PI74FCT2245T/2640T/2645T
Octal BidirectionalTransceivers
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 ..........................................................................................0.5W
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 ±5%)
Parameters Description
V
OH
V
OL
V
OL
V
IH
V
IL
I
IH
I
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
I
OFF
I
OS
V
H
Output HIGH Voltage
Output LOW Current
Output LOW Current
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Input HIGH Current
Input LOW Current
High Impedance
Output Current
Clamp Diode Voltage
Power Down Disable
Short Circuit Current
Input Hysteresis
V
CC
= Min., I
IN
= –18 mA
V
CC
= GND, V
OUT
= 4.5V
V
CC
= Max.
(3)
, V
OUT
= GND
—
–60
Test Conditions
(1)
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= Min., V
IN
= V
IH
or V
IL
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
(Except I/O pins) V
CC
= Max.
(Except I/O pins) V
CC
= Max.
(I/O pins Only) V
CC
= Max.
(I/O pins Only) V
CC
= Max.
V
CC
= M
AX
.
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
OUT
= 2.7V
V
OUT
= 0.5V
–0.7
—
–120
200
I
OH
= –15.0mA
I
OL
= 64mA
I
OL
= 12mA (25Ω Series)
2.0
0.8
1
–1
1
–1
1
–1
–1.2
100
Min. Typ
(2)
Max. Units
2.4
3.0
0.3
0.3
0.55
0.50
V
V
V
V
V
µA
µA
µA
µA
µA
µA
V
µA
mA
mV
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.
6
8
Max.
10
12
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 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.
2
PS2012B
09/22/99
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT245T/640T/645T
25 Ohm Series PI74FCT2245T/2640T/2645T
Octal BidirectionalTransceivers
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)
V
CC
= Max.
V
CC
= Max.,
V
CC
= Max.,
Outputs Open
OE = GND
T/R = GND or V
CC
One Input Toggling
50% Duty Cycle
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50% Duty Cycle
T/R = OE = GND
One Bit Toggling
V
CC
= Max.,
Outputs Open
f
I
= 2.5 MH
Z
50% Duty Cycle
T/R = OE = GND
Eight Bits Toggling
Test Conditions
(1)
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
0.15
Max.
500
2.0
0.25
Units
µA
mA
mA/
MHz
I
C
Total Power Supply
Current
(6)
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
1.5
1.8
3.5
(5)
4.5
(5)
6.0
(5)
14.0
(5)
mA
3.0
5.0
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 Icc formula. These limits are guaranteed but not tested.
6. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+ DI
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.
3
PS2012B
09/22/99
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT245T/640T/645T
25 Ohm Series PI74FCT2245T/2640T/2645T
Octal BidirectionalTransceivers
PI74FCT245T/2245T Switching Characteristics over Operating Range
245T/2245T
Com.
Min.
Max.
1.5
1.5
1.5
1.5
1.5
7.0
9.0
7.5
9.0
7.5
245AT/2245AT 245CT/2245CT
Com.
Com.
Min.
Max.
Min.
Max.
1.5
1.5
1.5
1.5
1.5
4.6
6.2
5.0
6.2
5.0
1.5
1.5
1.5
1.5
1.5
4.1
5.8
4.8
5.8
4.8
245DT
Com.
Min
Max. Unit
1.5
1.5
1.5
1.5
1.5
3.8
5.0
4.3
5.0
4.3
ns
ns
ns
ns
ns
Parameters Description
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
A to B, B to A
Output Enable Time
OE to A or B
Output Disable Time
OE to A or B
(3)
Output Enable Time
T/R to A or B
Output Disable Time
(3)
T/R to A or B
(3)
Conditions
(1)
C
L
= 50 pF
R
L
= 500 Ohm
PI74FCT640T/2640T Switching Characteristics over Operating Range
640T/2640T
Com.
Min.
Max.
2.0
2.0
2.0
2.0
2.0
7.0
13.0
10.0
13.0
10.0
640AT/2640AT 640CT/2640CT
Com.
Com.
Min.
Max.
Min.
Max.
1.5
1.5
1.5
1.5
1.5
5.0
6.2
5.0
6.2
5.0
1.5
1.5
1.5
1.5
1.5
4.4
5.8
4.8
5.8
4.8
640DT
Com.
Min.
Max. Unit
1.5
1.5
1.5
1.5
1.5
3.7
5.0
4.3
5.0
4.3
ns
ns
ns
ns
ns
Parameters Description
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
A to B, B to A
Output Enable Time
OE to A or B
Output Disable Time
OE to A or B
(3)
Output Enable Time
T/R to A or B
Output Disable Time
(3)
T/R to A or B
(3)
Conditions
(1)
C
L
= 50 pF
R
L
= 500 Ohm
PI74FCT645T/2645T Switching Characteristics over Operating Range
645T/2645T
Com.
Min.
Max.
1.5
1.5
1.5
1.5
1.5
9.5
11.0
12.0
11.0
12.0
645AT/2645AT 645CT/2645CT
Com.
Com.
Min.
Max.
Min.
Max.
1.5
1.5
1.5
1.5
1.5
4.6
6.2
5.0
6.2
5.0
1.5
1.5
1.5
1.5
1.5
4.1
5.8
4.8
5.8
4.8
645DT
Com.
Min.
Max. Unit
1.5
1.5
1.5
1.5
1.5
3.8
5.0
4.3
5.0
4.3
ns
ns
ns
ns
ns
Parameters Description
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
A to B, B to A
Output Enable Time
OE to A or B
Output Disable Time
OE to A or B
(3)
Output Enable Time
T/R to A or B
Output Disable Time
(3)
T/R to A or B
(3)
Conditions
(1)
C
L
= 50 pF
R
L
= 500 Ohm
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.
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
4
PS2012B
09/22/99
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