參數(shù)資料
型號(hào): UPD4702C
廠商: NEC Corp.
元件分類(lèi): 通用總線(xiàn)功能
英文描述: INCREMENTAL ENCODER 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS
中文描述: 增量式編碼器8位加/減計(jì)數(shù)器CMOS集成電路
文件頁(yè)數(shù): 2/16頁(yè)
文件大?。?/td> 167K
代理商: UPD4702C
2
μ
PD4702
BLOCK DIAGRAM
Reset
A
B
Phase
Discrimination
Edge Detection
8-Bit Up/Down Counter
8-Bit Latch
3-State Output
Carry
Borrow
STB
OE
CD
0–7
PIN FUNCTIONS
Function
Incremental signal A phase and B phase signal input pins (Schmitt input)
Count data output pins. Activated when OE is “L”, high impedance outputs when OE
is “H”.
8-bit counter carry signal output pin (active-low)
8-bit counter borrow signal output pin (active-low)
8-bit counter reset signal output pin
Counter is reset when this pin is “H”.
Count data output control signal input pin
Counter data output latch signal. Data is latched on the fall of STB, and is held while
STB = “L”.
Power supply input pin
Ground pin
Pin Name
Input/Output
A, B
Input
(Schmitt)
D
0 to 7
Output
(3-state)
Carry
Output
Borrow
Output
RESET
Input
(Schmitt)
OE
Input
STB
Input
V
DD
GND
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