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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。 |
部品番号 | UPD4704C |
| |
部品説明 | EXTENSION 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS | ||
メーカ | NEC | ||
ロゴ | |||
このページの下部にプレビューとUPD4704Cダウンロード(pdfファイル)リンクがあります。 Total 16 pages
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 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 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 | |||
ページ | 合計 : 16 ページ | ||
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PDF ダウンロード | [ UPD4704C データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
UPD4704 | EXTENSION 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS | NEC |
UPD4704C | EXTENSION 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS | NEC |
UPD4704G | EXTENSION 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS | NEC |