UPD4704 Datasheet PDF - NEC
Part Number | UPD4704 | |
Description | EXTENSION 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS | |
Manufacturers | NEC | |
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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
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Fig. 2 Relation Between STB Timing and Counter Value
UP/DOWN
STB
tSUDSTB1
tSUDSTB2
Pre-count value latched
Post-count value latched
Either pre- or post-count value latched
UP/DOWN
Fig. 3 STB and RESET Timing
tSUDSTB1
tDUDCD
RESET
STB
µPD4704
If STB changes from "H" to "L" and a reset is
executed in this period, the latch is also reset.
(3) Carry & borrow outputs
If the counter performs an up-count operation when the count value is 0FFH, an active-low pulse is output to the
Carry output (the pulse width is virtually the same as the UP or DOWN pulse L period). Similarly, if the counter
performs a down-count operation when the count value is 00H, an active-low pulse is output to the Borrow output.
A Borrow pulse is also output if a down-count operation is performed while RESET is "H" (during a reset), and
therefore, when a µPD4704 is added, a reset must be executed at the same time.
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for UPD4704 electronic component. |
Information | Total 16 Pages | |
Link URL | [ Copy URL to Clipboard ] | |
Download | [ UPD4704.PDF Datasheet ] |
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