UPD4991AGS Renesas Electronics America, UPD4991AGS Datasheet - Page 11

• Manufacturer Part Number: UPD4991AGS
• Manufacturer: Renesas Electronics America

Specifications of UPD4991AGS

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Positive power supply
Read control input
Write control input
Crystal signal pin
Crystal signal pin
Timing pulse 1
Timing pulse 2
Address input
Data bus pin
Chip select
Ground pin
Pin Name
Symbol
X
TP1
TP2
CS
CS
V
WE
V
OE
X
A
A
A
A
D
D
D
D
OUT
SS
DD
IN
0
1
2
3
0
1
2
3
1
2
DIP
15
10
11
12
13
14
16
17
18
1
2
3
4
5
6
7
8
9
Pin No.
CHAPTER 1 OUTLINE OF PD4991A
Table 1-1. Pin Functions
SOP
17
10
11
12
13
14
16
18
19
20
2
3
1
4
6
7
8
9
When CS
a CPU.
Outputs an alarm coincidence signal.
Outputs an interval timer signal
Specifies the internal address of the PD4991A.
While OE = “L”, the contents specified by the address bus are read to
the data bus.
The contents of the data bus are written to an address specified by the
address bus when WE rises.
Bidirectional 4-bit bus which inputs/outputs watch data.
Oscillation inverter output
Oscillation inverter input
1
= “L” and CS
2
= “H”, the PD4991A can transfer data with
Function
9