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PDF HD74HC162 Data sheet ( Hoja de datos )
| Número de pieza | HD74HC162 | |
| Descripción | Synchronous Decade/4-bit Binary/Counter(Direct Clear/Synchronous Clear) | |
| Fabricantes | Hitachi Semiconductor | |
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HD74HC160/HD74HC161/
HD74HC162/HD74HC163
Synchronous Decade Counter (Direct Clear)
Synchronous 4-bit Binary Counter (Direct Clear)
Synchronous Decade Counter (Synchronous Clear)
Synchronous 4-bit Binary Counter (Synchronous Clear)
Description
The HD74HC160 and the HD74HC162 are 4 bit decade counters, and the HD74HC161 and the
HD74HC163 are 4 bit binary counters All flip-flops are clocked simultaneously on the low to high to
transition (positive edge) of the clock input waveform.
These counters may be preset using the load input. Presetting of all four flip-flops is synchronous to thte
rising edge of clock. When load is held low counting is disabled and the data on the A, B, C, and D inputs
is loaded into the counter on the rising edge of clock. If the load input is taken high before the positive
edge of clock the count operation will be unaffected.
All of these counters may be cleared by utilizing the clear input. The clear function on the HD74HC162
and HD74HC163 counters are synchronous to the clock. That is, the counters are cleared on the positive
edge of clock while the clear input is held low.
The HD74HC160 and HD74HC161 counters are cleared asynchronously. When the clear is taken low the
counter is cleared immediately regardless of the clock.
Two active high enable inputs Enable P and Enable T and a ripple carry output are provided to enable easy
cascading of counters. Both enable inputs must be high to count. The Enable T input also enables the
Ripple Carry output. When enabled, the Ripple Carry outputs a positive pulse when the counter overflows.
This pulse is approximately equal in duration to the high level portion of the QA outputs. The Ripple Carry
output is fed to successive cascaded stages to facilitate easy implementation of N-bit counters.
Features
• High Speed Operation: tpd (Clock to Q) = 18 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
1 page  
HD74HC160/HD74HC161/HD74HC162/HD74HC163
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) (cont)
Ta = 25°C
Ta = –40 to
+85°C
Item
Pulse width
Symbol
tw
VCC (V)
2.0
4.5
Min Typ Max Min
80 — — 100
16 6 — 20
Max Unit
— ns
—
6.0 14 — — 17 —
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
Test Conditions
Function Table
Count Enable/Disable
Control Inputs
Load
Enable P
HH
LH
XL
XH
XL
Enable T
H
H
H
L
L
Result at Outputs
QA to QD
Count
No count
Ripple Carry Output
High when QA to QD are maximum
No count
No count
High when QA to QD are maximum
L
No count
L
5
5 Page 
HD74HC160/HD74HC161/HD74HC162/HD74HC163
HD74HC163
4-bit Binary Counter with Synchronous Clear
A
B
C
D
P
T
CK
LD
CLR
T
CK
CK
LD
LD
LD·CLR
LD·CLR
CLR
CLR
IN
Q
Q
T
CK
CK
LD
LD
LD·CLR
LD·CLR
CLR
CLR
IN
Q
Q
T
CK
CK
LD
LD
LD·CLR
LD·CLR
CLR
CLR
IN
Q
Q
T
CR
CR
LD
LD
LD·CLR
LD·CLR
CLR
CLR
IN
Q
Q
CK
CK
LD
LD
LD·CLR
LD·CLR
CLR
CLR
QA
QB
QC
QD
RCO
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet HD74HC162.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HD74HC160 | Synchronous Decade/4-bit Binary/Counter(Direct Clear/Synchronous Clear) | Hitachi Semiconductor |
| HD74HC161 | Synchronous Decade/4-bit Binary/Counter(Direct Clear/Synchronous Clear) | Hitachi Semiconductor |
| HD74HC162 | Synchronous Decade/4-bit Binary/Counter(Direct Clear/Synchronous Clear) | Hitachi Semiconductor |
| HD74HC163 | Synchronous Decade/4-bit Binary/Counter(Direct Clear/Synchronous Clear) | Hitachi Semiconductor |
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