CD54HC245_16 Datasheet, PDF (1/17 Pages) Texas Instruments – High-Speed CMOS Logic Octal-Bus Transceiver, Three-State, Non-Inverting

Data sheet acquired from Harris Semiconductor
SCHS119A
November 1997 - Revised May 2003
CD54HC245, CD74HC245,
CD54HCT245, CD74HCT245
High-Speed CMOS Logic Octal-Bus Transceiver,
Three-State, Non-Inverting
[ /Title
(CD54
HC245
,
CD54
HCT24
5,
CD74
HC245
,
CD74
HCT24
5)
/Sub-
ject
(High
Speed
Features
Description
• Buffered Inputs
• Three-State Outputs
• Bus Line Driving Capability
•
Typical Propagation Delay
= 5V, C_L = 15pF, T_A = 25^oC
(A
to
B,
B
to
A)
9ns
at
V_CC
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55^oC to 125^oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC
at V_CC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V_IL= 0.8V (Max), V_IH = 2V (Min)
- CMOS Input Compatibility, I_l ≤ 1µA at V_OL, V_OH
The CD54HC245, CD54HCT245, and CD74HC245,
CD74HCT245 are high-speed octal three-state bidirectional
transceivers intended for two-way asynchronous
communication between data buses. They have high drive
current outputs which enable high-speed operation while
driving large bus capacitances. They provide the low power
consumption of standard CMOS circuits with speeds and
drive capabilities comparable to that of LSTTL circuits.
The CD54HC245, CD54HCT245, CD74HC245 and
CD74HCT245 allow data transmission of the B bus or from
the B bus to the A bus. The logic level at the direction input
(DIR) determines the direction. The output enable input
(OE), when high, puts the I/O ports in the high-impedance
state.
The HC/HCT245 is similar in operation to the HC/HCT640
and the HC/HCT643.
Ordering Information
PART NUMBER
CD54HC245F3A
CD54HCT245F3A
CD74HC245E
CD74HC245M
TEMP.
RANGE (^oC)
-55 to 125
-55 to 125
-55 to 125
-55 to 125
PACKAGE
20 Ld CERDIP
20 Ld CERDIP
20 Ld PDIP
20 Ld SOIC
Pinout
CD54HC245, CD54HCT245
(CERDIP)
CD74HC245, CD74HCT245
(PDIP, SOIC)
TOP VIEW
CD74HC245M96
-55 to 125
20 Ld SOIC
CD74HCT245E
-55 to 125
20 Ld PDIP
CD74HCT245M
-55 to 125
20 Ld SOIC
CD74HCT245M96
-55 to 125
20 Ld SOIC
NOTE: When ordering, use the entire part number. The suffix 96
denotes tape and reel.
DIR 1
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
GND 10
20 V_CC
19 OE
18 B0
17 B1
16 B2
15 B3
14 B4
13 B5
12 B6
11 B7
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © 2003, Texas Instruments Incorporated
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