Data sheet acquired from Harris Semiconductor
SCHS189
CD74HC540, CD74HCT540,
CD74HC541, CD74HCT541
High Speed CMOS Logic
Octal Buffer and Line Drivers, Three-State
Description
The Harris CD74HC540 and CD74HCT540 are Inverting
Octal Buffers and Line Drivers with Three-State Outputs and
the capability to drive 15 LSTTL loads. The Harris
CD74HC541 and CD74HCT541 are Non-Inverting Octal Buff-
ers and Line Drivers with Three-State Outputs that can drive
15 LSTTL loads. The Output Enables (OE1) and (OE2) con-
trol the Three-State Outputs. If either OE1 or OE2 is HIGH the
outputs will be in the high impedance state. For data output
OE1 and OE2 both must be LOW.
January 1998
Features
鈥?CD74HC540, CD74HCT540 . . . . . . . . . . . . . . . Inverting
[ /Title
(CD74
HC540
,
CD74
HCT54
0,
CD74
HC541
,
CD74
HCT54
鈥?CD74HC541, CD74HCT541 . . . . . . . . . . . . . .Non-Inverting
鈥?Buffered Inputs
鈥?Three-State Outputs
鈥?Bus Line Driving Capability
鈥?Typical Propagation Delay = 9ns at V
CC
= 5V,
C
L
= 15pF, T
A
= 25
o
C
鈥?Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
鈥?Wide Operating Temperature Range . . . -55
o
C to 125
o
C
鈥?Balanced Propagation Delay and Transition Times
鈥?Signi铿乧ant Power Reduction Compared to LSTTL
Logic ICs
鈥?HC Types
- 2V to 6V Operation
- High Noise Immunity: N
IL
= 30%, N
IH
= 30% of V
CC
at V
CC
= 5V
鈥?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
鈮?/div>
1碌A at V
OL
, V
OH
Ordering Information
PART NUMBER
CD74HC540E
CD74HCT540E
CD74HC541E
CD74HCT541E
CD74HC540M
CD74HCT540M
CD74HC541M
CD74HCT541M
TEMP.
RANGE (
o
C)
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
PACKAGE
20 Ld PDIP
20 Ld PDIP
20 Ld PDIP
20 Ld PDIP
20 Ld SOIC
20 Ld SOIC
20 Ld SOIC
20 Ld SOIC
PKG.
NO.
E20.3
E20.3
E20.3
E20.3
M20.3
M20.3
M20.3
M20.3
NOTES:
1. When ordering, use the entire part number. Add the suf铿亁 96 to
obtain the variant in the tape and reel.
2. Wafer and die for this part number is available which meets all
electrical specifications. Please contact your local sales office or
Harris customer service for ordering information.
Pinouts
CD74HC540, CD74HCT540
(PDIP, SOIC)
TOP VIEW
OE
A0
A1
A2
A3
A4
A5
A6
A7
1
2
3
4
5
6
7
8
9
20 V
CC
19 OE2
18 Y0
17 Y1
16 Y2
15 Y3
14 Y4
13 Y5
12 Y6
11 Y7
CD74HC541, CD74HCT541
(PDIP, SOIC)
TOP VIEW
OE1
A0
A1
A2
A3
A4
A5
A6
A7
1
2
3
4
5
6
7
8
9
20 V
CC
19 OE2
18 Y0
17 Y1
16 Y2
15 Y3
14 Y4
13 Y5
12 Y6
11 Y7
GND 10
GND 10
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
漏
Harris Corporation 1998
File Number
1659.2
1
1
2
3
4
5
6
7
8
