ISD2500 ETC1 [List of Unclassifed Manufacturers], ISD2500 Datasheet - Page 9

• Manufacturer Part Number: ISD2500
• Description: Single-Chip Voice Record/Playback Devices 32-, 40-, 48-, 64-,60-,75,90-, and 120-Second Durations
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

Product Data Sheets
current cycle is terminated and the address pointer
is reset to address 0, the beginning of the message
space.
EOM Pin (RUN)
In Push-Button Operational Mode, EOM becomes
an active-HIGH RUN signal which can be used to
drive an LED or other external device. It is HIGH
whenever a Record or Playback operation is in
progress.
NOTE
1. The PD pin should be LOW, usually using a
2. The P/R pin is taken LOW.
3. The CE pin is pulsed LOW. Recording
4. The CE pin is pulsed LOW. Recording
5. The CE pin is pulsed LOW. Recording
6. When the recording sequences are fin-
Recording in Push-Button Mode
pulldown resistor.
starts, EOM goes HIGH to indicate an oper-
ation in progress.
pauses, EOM goes back LOW. The internal
address pointers are not cleared, but an
EOM marker is stored in memory to point to
the message end. The P/R pin may be
taken HIGH at this time. Any subsequent
CE would start a playback at address 0.
starts at the next address after the previous
set EOM marker. EOM goes back HIGH.
ished, the final CE pulse LOW will end the
last Record cycle, leaving a set EOM
marker at the message end. Recording may
also be terminated by a HIGH level on PD,
which will leave a set EOM marker.
If the M1 operational mode pin is also
HIGH, the just previously written EOM bit
is erased, and recording starts at that
address.)
NOTE
Good Audio Design Practices
ISD products are very high-quality single-chip
voice Recording and Playback systems. To ensure
the highest quality voice reproduction, it is impor-
tant that good audio design practices on layout and
power supply decoupling be followed. See the ISD
Application Notes and Design Manual in this book
for details.
*
1. The PD pin should be LOW.
2. The P/R pin is taken HIGH.
3. The CE pin is pulsed LOW. Playback starts,
4. If the CE pin is pulsed LOW or an EOM
5. CE is again pulsed LOW. Playback starts
6. Playback continues as in steps 4 and 5 until
7. If in overflow, pulling CE LOW will reset the
Playback in Push-Button Mode
Advance information: ISD2532/40/48/64 devices.
EOM goes HIGH to indicate an operation in
progress.
marker is encountered during an operation,
the part will pause. The internal address
pointers are not cleared, and EOM goes
back LOW. The P/R pin may be changed at
this time. A subsequent Record operation
would not reset the address pointers and
the recording would begin where Playback
ended.
where it left off, with EOM going HIGH to
indicate an operation in progress.
PD is pulsed HIGH or overflow occurs.
address pointer and start Playback from the
beginning. After a PD pulse, the part is reset
to address 0.
Push-button mode can be used in con-
junction with modes M0, M1, and M3.
ISD2500 Series
1–87
1