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PDF HD74HC390 Data sheet ( Hoja de datos )
| Número de pieza | HD74HC390 | |
| Descripción | Dual Decade Counters | |
| Fabricantes | Hitachi Semiconductor | |
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HD74HC390
Dual Decade Counters
Description
The HD74HC390 incorporate dual decade counters, each composed of a divide-by-two and a divide-by-
five counter. The divide-by-two and divide-by-five counters can be cascaded to form dual decade, dual bi-
quinary, or various combinations up to a single divide-by-100 counter.
The HD74HC390 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 truncation and allows the implementation of divide-by-N counter configurations.
Features
• High Speed Operation: tpd (Clock A to QA) = 11 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
A
X
X
B
X
X
Clear
H
L
L
Operation
Clear ÷2 and ÷5
Increment ÷2
Increment ÷5
1 page  
HD74HC390
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 — — 120 — 150 ns Clock A to QA
4.5 — 11 24 — 30
6.0 — — 20 — 26
tPLH 2.0 — — 290 — 365 ns Clock A to QC
tPHL 4.5 — 32 58 — 73
(QA connected to Clock B)
6.0 — — 49 — 62
tPLH 2.0 — — 130 — 165 ns Clock B to QB
tPHL 4.5 — 16 26 — 33
6.0 — — 22 — 28
tPLH 2.0 — — 185 — 230 ns Clock B to QC
tPHL 4.5 — 20 37 — 46
6.0 — — 31 — 39
tPLH 2.0 — — 130 — 165 ns Clock B to QD
tPHL 4.5 — 15 26 — 33
6.0 — — 22 — 28
tPHL 2.0 — — 165 — 205 ns Clear to QA, QB, QC, QD
4.5 — 14 33 — 41
6.0 — — 28 — 35
Pulse width tw 2.0 80 — — 100 — ns
4.5 16 8 — 20 —
6.0 14 — — 17 —
Removal time
th
2.0 25 — — 31 — ns
4.5 5 1 — 6 —
6.0 4 — — 5 —
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 HD74HC390.PDF ] | |
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