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PDF HT1612 Data sheet ( Hoja de datos )
| Número de pieza | HT1612 | |
| Descripción | Timer | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HT1612 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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HT1612
Timer with Dialer Interface
Features
• Operating voltage: 1.2V~1.7V
• Dialing number and conversation time display
• Conversation timer (Max. to 59 mins and 59
secs)
• Operation current: 10µA (Typ.)
Applications
• Timers
• LCD display drivers
General Description
The HT1612 is a CMOS chip designed for dialer
interface which drives 8 or 10 digits LCD. Vari-
ous functions, such as displaying dialing num-
ber and conversation time, are provided.
It normally shows blanks. The timer is started
to tell users how long the conversation time has
been taken when answering a telephone call.
After hanging up the telephone, it returns to
show blanks immediately. Whenever makeing a
• 32768Hz crystal
• 8 or 10 digits LCD display driver, 3V, 1/2
bias, 1/3 duty (8 digits hand-held calculator
LCD is used for 8 digits application)
• Built-in dialer interface
• Telephone display interface
• Instrument display
phone call, the HT1612 receives dialing data
from the dialer and displays the phone number
from left to right on the LCD. However, if there
is no dialing action within 10 seconds, it re-
starts the timer again. By adding a TIMER key,
the HT1612 can provide the timer reset/hold
functions (refer to functional description for
more details).
1 5th July ’95
1 page  
HT1612
Electrical Characteristics
(FOSC=32768Hz, Ta=25°C)
Symbol
Parameter
Test Condition
VDD
Condition
VDD Operating Voltage
—
—
VIL Input Low Voltage
1.2V~1.7V
—
VIL Input High Voltage
1.2V~1.7V
—
ISTB Stand-by Current
1.5V
VHK=Floating
(or VDD)
IDD Operating Current
1.5V No load
IOL
Output Sink Current of
INT
1.5V
VO=0.3V
TA Data Setup Time
1.5V
—
TB Data Hold On Time
1.5V
—
TC Inter Digit Time
1.5V
—
TDB
Debounce Time
(HK, TMIER)
1.5V
—
Min. Typ. Max. Unit
1.2
VSS
0.8VDD
1.5 1.7
— 0.2VDD
— VDD
V
V
V
— 0.1 1 µA
— 10 30 µA
500 1000 — µA
1 — — µs
2 — — µs
5 — — µs
— 31.25 –
ms
RHI
RLO
FOSC
Pull-High Resistance
(HK , DI, SK)
Pull-Low Resistance
(TIMER)
System Frequency
1.5V VIN=0V
— 1 — MΩ
1.5V
1.5V
VTIMER=1.5V
—5—
Crystal=32768Hz — 32768 —
MΩ
Hz
5 5th July ’95
5 Page 
For instrument or µC use (1.5V supply)
HT1612
∗ The IC substrate should be connected to VDD in the PCB layout artwork.
Note: 1. To drive the SK, DI, and HK pin, an open drain NMOS output structure is recommended.
2. To drive the SK, DI and HK pin with CMOS output structure, a voltage divider is needed
(R=4.3K, R1=10K).
11 5th July ’95
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet HT1612.PDF ] | |
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