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參數(shù)資料
| 型號(hào)： | HEF4737BD |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通用總線功能 |
| 英文描述： | Quadruple static decade counters |
| 中文描述： | 4000/14000/40000 SERIES, ASYN POSITIVE EDGE TRIGGERED 17-BIT UP DECADE COUNTER, CDIP18 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大小： | 63K |
| 代理商： | HEF4737BD |
January 1995
4
Philips Semiconductors
Product specification
Quadruple static decade counters
HEF4737B
HEF4737V
multiplexer. A LOW level at this input disables the BCD
outputs making them floating (high impedance off-state).
Digit select inputs (S
A
, S
B
, S
C
)
Notes
1.
2.
3.
4.
H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
X = state is immaterial
When D5 is selected, the contents of D5 is available at
O
0
and O
1
, O
2
and O
3
are LOW.
LSD = least significant divider
MSD = most significant divider
5.
6.
S
A
L
H
L
H
X
S
B
L
L
H
H
X
S
C
L
L
L
L
H
selects D1 (LSD)
selects D2
selects D3
selects D4
selects D5 (MSD)
Output signals
The carry outputs are active LOW outputs.
Carry output CO
2
When the contents of the first two decades of the counter
are both 9 then the CO
2
output becomes LOW. It remains
LOW until the next LOW to HIGH transition of the count
input, i.e. until the contents of the first two decades are
zero. CO
2
is LOW when the contents of the counter are: 00
099, 00 199, 00 299 etc.
Carry output CO
3
When the contents of the first three decades of the counter
are all 9 then the CO
3
output becomes LOW. It remains
LOW until the next LOW to HIGH transition of the count
input, i.e. until the contents of the first three decades are
zero. CO
3
is LOW when the contents of the counter are
00 999, 01 999, 02 999 etc.
Carry output CO
4
When the contents of the first four decades of the counter
are all 9 then the CO
4
output becomes LOW. It remains
LOW until the next LOW to HIGH transition of the count
input, i.e. until the contents of the first four decades are
zero. CO
4
is LOW when the contents of the counter are
09 999 and 19 999.
The carry signals CO
2
, CO
3
and CO
4
are suppressed
while the preset is active. A HIGH to the preset input sets
the counter to 19 999 but the carry signals remain HIGH
until preset input returns to LOW, then the carry outputs
will also become LOW.
Carry output CO
5
When the content of the counter is 10 000 the CO
5
output
becomes LOW. It returns to HIGH when the content of the
counter is zero.
Digit outputs (O
0
to O
3
)
The digit outputs give the contents of the selected latch.
The output is in the form of BCD, positive logic.
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