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PDF HD74HC674 Data sheet ( Hoja de datos )
| Número de pieza | HD74HC674 | |
| Descripción | 16-bit Shift Register | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74HC674
16-bit Shift Register
Description
The HD74HC674 is a 16-bit parallel-in, serial-out shift register. A three-state input/output (data I/O) port
provides access for entering serial data or reading the shift-register word in a recirculating loop.
The device has four basic modes of operation:
1. Hold (do nothing)
2. Write (serially via input/output)
3. Read (serially)
4. Load (parallel via data inputs)
Low-to-high-level changes at the chip select input should be made only when the clock input is low to
prevent false clocking.
Features
• High Speed Operation: tpd (CLK to SER/Q15) = 17 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 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
CS
H
L
L
L
R/W
X
L
H
H
Mode
X
X
L
H
CLK
X
SER/Q15
Z
Z
Q14n
P15
Operation
Do nothing
Shift and write (serial load)
Shift and read
Parallel load
1 page  
HD74HC674
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25°C
Ta = –40 to
+85°C
Item
Maximum clock
frequency
Symbol
f max
VCC (V)
2.0
4.5
Min Typ Max Min
——5 —
— — 27 —
Max Unit Test Conditions
4 MHz
21
6.0 — — 32 — 25
Propagation delay tPLH
time
t PHL
2.0 — — 200 — 250 ns Clock to SER/Q15
4.5 — 17 40 — 50
6.0 — — 34 — 43
Output enable
time
t ZH
t ZL
2.0 — — 150 — 190 ns
4.5 — 12 30 — 38
6.0 — — 26 — 33
Output disable
time
t HZ
t LZ
2.0 — — 150 — 190 ns
4.5 — 14 30 — 38
6.0 — — 26 — 33
Pulse width tw 2.0 80 — — 100 — ns
4.5 16 6 — 20 —
6.0 14 — — 17 —
Setup time
tsu 2.0 100 — — 125 — ns SER/Q15 to Clock
4.5 20 — — 25 —
6.0 17 — — 21 —
tsu 2.0 100 — — 125 — ns P to Clock
4.5 20 — — 25 —
6.0 17 — — 21 —
tsu 2.0 100 — — 125 — ns Mode to Clock
4.5 20 — — 25 —
6.0 17 — — 21 —
tsu 2.0 100 — — 125 — ns R/W or CS to Clock
4.5 20 — — 25 —
6.0 17 — — 21 —
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet HD74HC674.PDF ] | |
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