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PDF HT8656 Data sheet ( Hoja de datos )
| Número de pieza | HT8656 | |
| Descripción | Talking Back | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HT8656 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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HT8656www.DataSheet4U.com
Talking Back
Features
• Operating voltage: 4.5V~5.5V
• ADM algorithm
• DRAM selection:
– 64K
– 256K
• Sampling rate selection:
– 32Kb
– 16Kb
• Auto stop recording
– 0.5 seconds silence is detected
– Recording capacity is full
• Built-in 2-stage microphone amplifier
• Built-in DRAM refresh circuit
• Voltage type D/A output
• Current type D/A output
• Auto record and playback
• Auto power-off
• Low power consumption
Applications
• Toys
• Education
General Description
The HT8656 is a single chip CMOS LSI for
talking back applications using an ADM algo-
rithm. Functions of the IC consist of record-
ing/playing as well as auto power off. It starts
recording when a sound input is detected, and
stops to play back when silence lasts 0.5 sec-
onds during recording. The auto power off func-
tion is activated once a REC/PLAY cycle has
been implemented 64 times or an interval of
silence exceeds 2 minutes.
• Games
The HT8656 provides a recording capacity of 2
seconds for DRAM of 64K and 8 seconds for
DRAM of 256K at a 32Kb sampling rate and
double recording capacity at a 16Kb sampling
rate. A higher sampling rate will result in
sounds of better quality but sacrifice the record-
ing time, and vice versa.
1 5th May ’98
1 page  
Absolute Maximum Ratings*
Supply Voltage ................................. –0.3V to 6V
Input Voltage................. VSS–0.3V to VDD+0.3V
HT8656
www.DataSheet4U.com
Storage Temperature................. –50°C to 125°C
Operating Temperature............... –20°C to 70°C
*Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maxi-
mum Ratings” may cause substantial damage to the device. Functional operation of this
device at other conditions beyond those listed in the specification is not implied and prolonged
exposure to extreme conditions may affect device reliability.
Electrical Characteristics
Symbol
Parameter
Test Conditions
VDD Conditions
VDD Operating Voltage
——
IDD Operating Current
5V
No load,
fOSC=640kHz
ISTB Standby Current
5V —
IO Max. AUD Source Current 5V VOH=0.6V
IOL MOTOR Source Current
5V VOH=4.5V
IOL LED Sink Current
5V VOL=0.5V
VIH “H” Input Voltage
——
VIL “L” Input Voltage
——
VOUT Max. VOUT Output Voltage 5V RL>50kΩ
fOSC Oscillating Frequency
5V ROSC=43kΩ
(Ta=25°C)
Min. Typ. Max. Unit
4.5 — 5.5
V
— 1.5 3.0 mA
—
–1.5
–1
3.0
0.7VDD
0
—
—
600 800
–3.0 —
–3.5 —
5.0 —
— VDD
— 0.3VDD
1.5 —
640 —
µA
mA
mA
mA
V
V
VP-P
kHz
Functional Description
The HT8656 is a single chip LSI with an exter-
nal DRAM. It is designed for talking back appli-
cations. The recording length of the IC is
determined by the data rate along with the size
of an external memory. Sounds coming from an
external microphone are coded through an in-
ternal ADM algorithm and saved in an external
memory until the memory is full or an interval
of silence lasts over 0.5 seconds. Once recording
is terminated, the IC will play back the recorded
sounds automatically.
Record function
The HT8656 provides two kinds of sampling
rate and DRAM size selection to determine the
recording capacity. The recording capacity is
determined as shown on the following table.
5 5th May ’98
5 Page 
• Package form
HT8656
www.DataSheet4U.com
11 5th May ’98
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet HT8656.PDF ] | |
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