ISD2500 View Datasheet(PDF) - Information Storage Devices
Part Name
Description
Manufacturer
ISD2500
Information Storage Devices
ISD2500 Datasheet PDF : 28 Pages
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ISD2500 Series
Product Data Sheets
Playback only, and is typically used with the M4
Operational Mode.
M1 — Delete EOM Markers
The M1 Operational Mode allows sequentially
recorded messages to be combined into a single
message with only one EOM marker set at the end
of the final message. When this operational mode
is configured, messages recorded sequentially are
played back as one continuous message.
M2 — Unused
When operational modes are selected, the M2 pin
should be LOW.
M3 — Message Looping
The M3 Operational Mode allows for the auto-
-1 matic, continuously repeated playback of the
message located at the beginning of the address
space. A message CAN completely fill the ISD2500
device and will loop from beginning to end without
OVF going LOW.
M4 — Consecutive Addressing
During normal operations, the address pointer will
reset when a message is played through to an
EOM marker. The M4 Operational Mode inhibits
the address pointer reset on EOM, allowing mes-
sages to be played back consecutively.
M5 — CE-Level Activated
The default mode for ISD2500 devices is for CE to
be edge-activated on Playback and level-activated
on Record. The M5 Operational Mode causes the
CE pin to be interpreted as level-activated as
opposed to edge-activated during Playback. This
is specifically useful for terminating Playback oper-
ations using the CE signal.
In this mode, CE LOW begins a Playback cycle, at
the beginning of the device memory. The Playback
cycle continues as long as CE is held LOW. When
CE goes HIGH, Playback will immediately end. A
new CE LOW will restart the message from the
beginning unless M4 is also HIGH.
M6 — Push-Button Mode
The ISD2500 Series of devices contain a Push-
Button operational mode. The Push-Button mode
is used primarily in very low-cost applications and
is designed to minimize external circuitry and com-
ponents, thereby reducing system cost. In order to
configure the device in Push-Button operational
mode, the two most significant address bits must
be HIGH, and the M6 mode pin must also be
HIGH. A device in this mode always powers down
at the end of each Playback or Record
cycle after CE goes HIGH.
When this operational mode is implemented, sev-
eral of the pins on the device have alternate
functionality:
Pin Name
CE
PD
EOM
Alternate Functionality in
Push-Button Mode
Start/Pause Push-Button
(LOW pulse-activated)
Stop/Reset Push-Button
(HIGH pulse activated)
Active-HIGH Run Indicator
CE Pin (START/PAUSE)
In Push-Button Operational Mode, CE acts as a
LOW-going pulse-activated START/PAUSE sig-
nal. If no operation is currently in progress, a LOW-
going pulse on this signal will initiate a Playback or
a Record cycle according to the level on the P/R
pin. A subsequent pulse on the CE pin, before an
End-Of-Message is reached in Playback or an
overflow condition occurs, will cause the device to
pause. The address counter is not reset, and
another CE pulse will cause the device to continue
the operation from the place where it was paused.
PD Pin (STOP/RESET)
In push-button Operational Mode, PD acts as a
HIGH-going pulse-activated STOP/RESET signal.
When a Playback or Record cycle is in progress
and a HIGH-going pulse is observed on PD, the
1–86
* Advance information: ISD2532/40/48/64 devices.
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