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UPD4704C の電気的特性と機能

UPD4704CのメーカーはNECです、この部品の機能は「EXTENSION 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS」です。


製品の詳細 ( Datasheet PDF )

部品番号 UPD4704C
部品説明 EXTENSION 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS
メーカ NEC
ロゴ NEC ロゴ 




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UPD4704C Datasheet, UPD4704C PDF,ピン配置, 機能
DATA SHEET
MOS INTEGRATED CIRCUIT
µPD4704
EXTENSION 8-BIT UP/DOWN COUNTER
CMOS INTEGRATED CIRCUITS
DESCRIPTION
The µPD4704 is 8-bit up/down counters for extension of the µPD4702 incremental encoder counter. They perform
an up/down-count using an 8-bit width with a µPD4702 carry or borrow signal as input. In addition, a carry output
and borrow output are also provided for further extension of the count width, enabling extension to be performed
in 8-bit units.
FEATURES
8-bit up/down counter for extension of µPD4702
Count data output controllable (latch and 3-state output)
Extension carry and borrow outputs
CMOS, single +5 V power supply
PIN NAMES
Up : Up-count input
Down : Down-count input
Reset : Counter reset input
STB : Latch strobe signal input
OE : Output control signal input
CD0-7 : Count data outputs
Carry : Carry pulse output
Borrow : Borrow pulse output
ORDERING INFORMATION
Part Number
µPD4704C
µPD4704G
Package
20-pin plastic DIP (300 mil)
20-pin plastic SOP (300 mil)
PIN CONFIGURATION (Top View)
Reset
A
B
NC
CD0
CD1
CD2
CD3
NC
VSS
1
2
3
4
5
6
7
8
9
10
20 VDD
19 Carry
18 Borrow
17 STB
16 OE
15 CD7
14 CD6
13 CD5
12 CD4
11 NC
Document No. IC-3305A (2nd edition)
(O. D. No. IC-8762B)
Date Published April 1997 P
Printed in Japan
© 1993

1 Page





UPD4704C pdf, ピン配列
µPD4704
TRUTH TABLE 1 (COUNTER BLOCK)
UP
DOWN
RESET
Carry
× ×H×
H H×
H L×
HL ×
L L×
LL×
HL L H
LHL L
Borrow
×
×
×
×
×
L
H
Remarks
× : H or L
Reset
Reset
Down-count
Up-count
Disabled (count undefined)
Disabled (count undefined)
Borrow output when count = 00H
Carry output when count = 0FFH
TRUTH TABLE 2 (LATCH & OUTPUT BLOCKS)
STB
×
×
H
L
× : H or L
OE CD0 to CD7
H Output disable (3-state)
L Output enable
× Data through (count value load)
× Data latch (count value retention)
3


3Pages


UPD4704C 電子部品, 半導体
µPD4704
2. OPERATING PRECAUTIONS
As the µPD4704 incorporates an 8-bit counter, a large transient current flows in the case of a count value which
changes all the bits (such as 00H 0FFH or 7FH 080H). This will cause misoperation unless the impedance of the
power supply line is sufficiently low. It is therefore recommended that a decoupling capacitor (of around 0.1 µF)
be connected between VDD and VSS right next to the IC as shown in Fig. 4.
Fig. 4 Decoupling Capacitor
C
VDD
+5 V
µPD4704 C : 0.1 uF tantalum electrolytic laminated
ceramic capacitor, etc.
VSS
6

6 Page



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共有リンク

Link :


部品番号部品説明メーカ
UPD4704

EXTENSION 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS

NEC
NEC
UPD4704C

EXTENSION 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS

NEC
NEC
UPD4704G

EXTENSION 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS

NEC
NEC


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