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Número de pieza | HD74HC393 | |
Descripción | Dual 4-bit Binary Counters | |
Fabricantes | Hitachi Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de HD74HC393 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
No Preview Available ! HD74HC393
Dual 4-bit Binary Counters
Description
The HD74HC393 contain two 4-bit ripple carry binary counters, which can be cascaded to create a single
divide-by-256 counter.
The HD74HC393 is incremented on the high to low transition (negative edge) of the clock input, and each
has an independent clear input. when clear is set high all four bits of each counter are set to a low level.
This enables count trucation and allows the implementation of divide-by-N counter configurations.
Features
• High Speed Operation: tpd (A to QA) = 16 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
Clock
X
H
L
Clear
H
L
L
L
L
Outputs
L
No change
No change
No change
Advance to next state
1 page HD74HC393
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 —
— — 25 —
Max Unit Test Conditions
4 MHz
20
6.0 — — 29 — 24
Propagation delay tPLH
time
t PHL
2.0 — — 120 — 150 ns Clock to QA
4.5 — 16 24 — 30
6.0 — — 20 — 26
tPLH 2.0 — — 185 — 230 ns Clock to QB
tPHL 4.5 — 20 37 — 46
6.0 — — 31 — 39
tPLH 2.0 — — 220 — 275 ns Clock to QC
tPHL 4.5 — 24 44 — 55
6.0 — — 37 — 47
tPLH 2.0 — — 260 — 325 ns Clock to QD
tPHL 4.5 — 28 52 — 65
6.0 — — 44 — 55
tPHL 2.0 — — 150 — 190 ns Clear to QA, QB, QC, QD
4.5 — 21 30 — 38
6.0 — — 28 — 33
Pulse width tw 2.0 80 — — 100 — ns Clock, clear
4.5 16 — — 20 —
6.0 14 — — 17 —
Removal time
th
2.0 50 — — 65 — ns Clear to clock
4.5 10 — — 13 —
6.0 9 — — 11 —
Output rise/fall
time
t TLH
t THL
2.0 — — 75 — 95 ns
4.5 — 5 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
5
5 Page |
Páginas | Total 9 Páginas | |
PDF Descargar | [ Datasheet HD74HC393.PDF ] |
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