isd1740a Winbond Electronics Corp America, isd1740a Datasheet - Page 10

• Manufacturer Part Number: isd1740a
• Description: Multi-message Single-chip Voice Record&playback Devices
• Manufacturer: Winbond Electronics Corp America

PIN NAME
ERASE
FWD
RDY
REC
V
SSD
Note:
[1]
600 k:
PIN NO.
PDIP
24
25
26
27
28
Record: The device starts recording whenever
to Low and stays at Low. Recording stops when the signal returns to
High. This pin has an internal pull-up device
(T
Erase: When active, it starts an erase operation. Erase operation will take
place only when the playback pointer is positioned at either the first or last
message. Pulsing this pin to Low enables erase operation and deletes the
current message. Holding this pin Low for more than 3 sec. initiates a
global erase operation, and will delete all the messages. This pin has an
internal pull-up device
end, allowing the use of a push button switch.
Forward: When triggered, it advances to the next message from the
current location, when the device is in power down status. During
playback cycle, pulsing this pin Low stops the current playback operation
and advances to the next message, and then re-starts the playback
operation of the new message. This pin has an internal pull-up device
and an internal debounce (T
push button switch.
Ready: An open drain output. This pin stays Low during record, play,
erase and forward operations and stays High in power down state.
Digital Ground: It is important to have a separate path for each ground
signal including V
coupling..
Deb
)
[2]
[2]
TDeb = Refer to AC Timing
for start and end, allowing the use of a push button switch.
SSA
- 10 -
, V
[1]
and an internal debounce (T
SSD
Deb
, V
FUNCTIONS
)
[2]
SSP1
for start and end, allowing the use of a
and V
ISD1700A SERIES
SSP2
[1]
and an internal debounce
REC
to minimize the noise
switches from High
Deb
)
[2]
for start and
[1]