ISD1700A Datasheet, PDF (10/31 Pages) Winbond – Multi-Message Single-Chip Voice Record&Playback Devices

ISD1700A SERIES
PIN NAME
REC
PDIP
PIN NO.
24
ERASE
25
FWD
26
RDY
27
V_SSD
28
Note: ^[1] 600 kΩ
FUNCTIONS
Record: The device starts recording whenever REC switches from High
to Low and stays at Low. Recording stops when the signal returns to
High. This pin has an internal pull-up device ^[1] and an internal debounce
(T_Deb) ^[2] for start and end, allowing the use of a push button switch.
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 ^[1] and an internal debounce (T_Deb) ^[2] for start and
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 ^[1]
and an internal debounce (T_Deb) ^[2] for start and end, allowing the use of a
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_SSA, V_SSD, V_SSP1 and V_SSP2 to minimize the noise
coupling..
[2] _{TDeb = Refer to AC Timing}
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