74173 Outputs Datasheet

74173 Datasheet, PDF, Equivalent


Part Number

74173

Description

4-bit D-type Register (with 3-state Outputs)

Manufacture

Hitachi Semiconductor

Total Page 9 Pages
Datasheet
Download 74173 Datasheet


74173
HD74HC173
4-bit D-type Register (with 3-state Outputs)
Description
The four D type Flip-Flops operate synchronously from a common clock. The 3-state outputs allow the
device to be used in bus organized systems. The outputs are placed in the 3-stage mode when either of the
output disable pins are in the logic high level.
The input disable allows the flip-flops to remain in their present states without having to disrupt the clock.
If either of the 2 input disables are taken to a logic high level, the Q outputs are fed back to the inputs,
forcing the flip-flops to remain in the same state. Clearing is enabled by taking the clear input to a logic
high level. The data outputs change state on the positive going edge of the clock.
Features
High Speed Operation: tpd (Clock to Q) = 14 ns typ (CL = 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: VCC = 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Inputs
Data Enable
Clear
Clock
G1
G2
Data D
Output Q
HX X X X L
L L X X X Q0
L H X X Q0
L X H X Q0
L LL L L
L LL HH
Note: When either M or N (or both) is (are) high the output is disabled to the high-impedance state;
however sequential operation of the flip-flops is not affected.

74173
HD74HC173
Pin Arrangement
Output
Control
M1
N2
1Q 3
Output
2Q 4
3Q 5
4Q 6
Clock 7
GND 8
Output
Control Clear
1Q 1D
2Q 2D
3Q 3D
4Q 4D
CK Data
Enable
16 VCC
15 Clear
14 1D
13 2D
Data
12 3D Input
11 4D
10 G2 Data
Enable
9 G1 Input
(Top view)
Absolute Maximum Ratings
Item
Supply voltage range
Input voltage
Output voltage
DC current drain per pin
DC current drain per VCC, GND
DC input diode current
DC output diode current
Power dissipation per package
Storage temperature
Symbol
VCC
VIN
VOUT
I OUT
ICC, IGND
I IK
I OK
PT
Tstg
Rating
–0.5 to +7.0
–0.5 to VCC + 0.5
–0.5 to VCC + 0.5
±35
±75
±20
±20
500
–65 to +150
Unit
V
V
V
mA
mA
mA
mA
mW
°C
2


Features HD74HC173 4-bit D-type Register (with 3- state Outputs) Description The four D type Flip-Flops operate synchronously f rom a common clock. The 3-state outputs allow the device to be used in bus org anized systems. The outputs are placed in the 3-stage mode when either of the output disable pins are in the logic hi gh level. The input disable allows the flip-flops to remain in their present s tates without having to disrupt the clo ck. If either of the 2 input disables a re taken to a logic high level, the Q o utputs are fed back to the inputs, forc ing the flip-flops to remain in the sam e state. Clearing is enabled by taking the clear input to a logic high level. The data outputs change state on the po sitive going edge of the clock. Featur es • • • • • High Speed Opera tion: tpd (Clock to Q) = 14 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µ A max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) F.
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