CH224ATF(1999) Ver la hoja de datos (PDF) - Cermetek Microelectronics
Número de pieza
componentes Descripción
Fabricante
CH224ATF Datasheet PDF : 14 Pages
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PRELIMINARY
GND
DCDIND
RXDIND
~DTRIND
SPKR
GND
OG
OG
OG
O(DF)
CH224ATF
ring by going off-hook and beginning the handshake sequence.
The response of the modem to the ~DTR signal is very slow (up to 10
ms) to prevent noise from falsely causing the modem to disconnect from
the telephone line.
Ground
LED drivers are open-drain inverter-driven (74HCT05) lines with
1.5K ½, 1/10W pull-up resistors on-board.
DCD LED indicator. Active high DCD status.
RXD LED indicator. Active high RXD status.
DTR LED indicator. Active high TXD status.
Speaker Analog Output. The SPKR output reflects the received analog
input signal. The SPKR is controlled by the ATMn command.
SKR is tied directly to SPKR pin of the data pump.
Parameter
Input High Voltage
Type IA
Type IC
Type IH
Input Low Voltage
Type IA and IC
Input Low Voltage
Type IF
Input Leakage Current
IA and IC
Output High Voltage
Type OA
Type OD
Type OG
Table 10. Digital Interface Characteristics
Sy Min. Typ. Max. Units
mb
ol
VIH
2.0
3.5
Vdc
-
VCC
-
VCC
-30
VI L
-
30
Vdc
-0.3
VI L
-
0.8
-
Vrms
38
IIN
-
VOH
-
+10 µAdc
-
Vdc
2.4
-
-
-
-
VCCV
-
- CC
Test Conditions
Note 2
VIN=0 to VCC
ILOAD = 100µA
ILOAD = 0 mA
Output Low Voltage
VO L
Type OA
Type OB
Type OD
Type OG
Three –State (Off) Current
I TS
Notes:
Vdc
ILOAD = 1.6 mA
ILOAD = 0.8 mA
ILOAD = 15 mA
ILOAD = 8 mA
+25 µAdc
VIN=0.8 V to 4.5V
1. Test Conditions: VCC = 5V + 5%, TA = 0°C to 70°C (unless otherwise stated.)
Output loads: 50 pF + one TTL.
2. AC Vrms voltage between Tip and Ring, using the on-boatd modular DAA.
©1999 Cermetek Microelectronics, Inc.
9
Document No. 607-0005 Rev.A (11/99)
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