HCF4029B 查看數據表（PDF） - STMicroelectronics

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HCF4029B

PRESETTABLE UP/DOWN COUNTER BINARY OR BCD DECADE

STMicroelectronics 

HCF4029B

signal is normally high and the counter reaches its

maximum count in the UP mode or the minimum

count in the DOWN mode provided the CARRY-IN

signal is low. The CARRY-IN signal in the low

state can thus be considered a CLOCK ENABLE.

The CARRY-IN terminal must be connected to

VSS when not in use. Binary counting is

accomplished when the BINARY/DECODE input

is high; the counter counts in the decade mode

when the BINARY/DECADE input is low. The

counter counts Up when to UP/DOWN INPUT is

high, and Down when the UP/DOWN INPUT is

low. Multiple packages can be connected in either

a parallel clocking or a ripple clocking

arrangement. Parallel clocking provides

synchronous control and, hence, a faster

response from all counting outputs. Ripple

clocking allows for longer clock input rise and fall

times.

IINPUT EQUIVALENT CIRCUIT

FUNCTIONAL DIAGRAM

PIN DESCRIPTION

PIN No

SYMBOL NAME AND FUNCTION

15

5

9

10

1

4, 12, 13, 3

6, 11, 14, 2

7

8

16

CLOCK Clock Input

CARRY IN Carry In Input

BINARY/

DECADE

Binary / Decade Select

UP/DOWN Up/Down Select

PRESET

ENABLE

Preset Enable Input

JAM1 to JAM4 Jam Input Signals

Q1 to Q4 Q Outputs

CARRY OUT Carry Out Outputs

VSS

Negative Supply Voltage

VDD

Positive Supply Voltage

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