CD74HC245 Transceiver Datasheet

CD74HC245 Datasheet, PDF, Equivalent


Part Number

CD74HC245

Description

High-Speed CMOS Logic Octal-Bus Transceiver

Manufacture

etcTI

Total Page 16 Pages
Datasheet
Download CD74HC245 Datasheet


CD74HC245
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, CL = 15pF, TA = 25oC
(A
to
B,
B
to
A)
9ns
at
VCC
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55oC to 125oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
VIL= 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il 1µA at VOL, VOH
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 VCC
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
1

CD74HC245
CD54HC245, CD74HC245, CD54HCT245, CD74HCT245
Functional Diagram
2
A0
3
A1
4
A2
5
A3
6
A4
7
A5
8
A6
9
A7
1
DIR
19
OE
18
B0
17
B1
16
B2
15
B3
14
B4
13
B5
12
B6
11
B7
TRUTH TABLE
CONTROL INPUTS
OE DIR
OPERATION
LL
B Data to A Bus
LH
A Data to B Bus
HX
Isolation
H = High Level, L = Low Level, X = Irrelevant
To prevent excess currents in the High-Z (Isolation) modes all I/O
terminals should be terminated with 10kto 1Mresistors.
2


Features Data sheet acquired from Harris Semicond uctor SCHS119A November 1997 - Revised May 2003 CD54HC245, CD74HC245, CD54HCT 245, CD74HCT245 High-Speed CMOS Logic O ctal-Bus Transceiver, Three-State, Non- Inverting [ /Title (CD54 HC245 , CD54 HCT24 5, CD74 HC245 , CD74 HCT24 5) /Su bject (High Speed Features Descriptio n • Buffered Inputs • Three-State Outputs • Bus Line Driving Capabili ty • Typical Propagation Delay = 5V , CL = 15pF, TA = 25oC (A to B, B to A) 9ns at VCC • Fanout (Over Temperature Range) - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads • Wide Operating Temperature Range . . . -55o C to 125oC • Balanced Propagation De lay and Transition Times • Signific ant Power Reduction Compared to LSTTL L ogic ICs • HC Types - 2V to 6V Opera tion - High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V • HCT Ty pes - 4.5V to 5.5V Operation - Direct LSTTL Input Logic Compatibility, VIL= 0.8V (Max.
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