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| CY74FCT2245T Datasheet, PDF (1/7 Pages) Texas Instruments – 8-Bit Transceiver | |||
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Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modiï¬ed to remove devices not offered.
CY74FCT2245T
SCCS037 - July 1994 - Revised March 2000
8-Bit Transceiver
Features
⢠Function and pinout compatible with FCT and F logic
⢠25⦠output series resistors to reduce transmission line
reï¬ection noise
⢠FCT-C speed at 4.1 ns max.
FCT-A speed at 4.6 ns max.
⢠Edge-rate control circuitry for signiï¬cantly improved
noise characteristics
⢠Power-off disable feature
⢠Fully compatible with TTL input and output logic levels
⢠ESD > 2000V
⢠Sink current
12 mA
Source current 15 mA
⢠Extended commercial temp. range of â40ËC to +85ËC
⢠Three-state outputs
Functional Description
The FCT2245T contains eight non-inverting, bidirectional buffers
with three-state outputs intended for bus oriented applications.
On-chip termination resistors have been added to the outputs to
reduce system noise caused by reflections. For this reason, the
FCT2245T can be used in an existing design to replace the
FCT245T. The FCT2245T current sinking capability is 12 mA at the
A and B ports.
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; receive (Active LOW) enables
data from B ports to A ports. The output enable (OE) input, when
HIGH, disables both the A and B ports by putting them in a High Z
condition.
The outputs are designed with a power-off disable feature to
allow for live insertion of boards.
Logic Block Diagram
T/R
OE
A0
B0
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
FCT2245Tâ1
Pin Configurations
DIP/SOIC/QSOP
Top View
T/R 1
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
GND 10
20 VCC
19 OE
18 B0
17 B1
16
B2
15 B3
14
B4
13 B5
12 B6
11 B7
FCT2245Tâ3
Function Table[1]
Inputs
OE
T/R
Output
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
High Z State
Note:
1. H = HIGH Voltage Level. L = LOW Voltage Level. X = Donât Care.
Copyright © 2000, Texas Instruments Incorporated
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