CH1786ET 데이터 시트보기 (PDF) - Unspecified
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CH1786ET Datasheet PDF : 18 Pages
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Cermetek Microelectronics, Inc.
CH1786 Family of Ultra Small 2400bps Modems
Table 8. CH1786 Electrical Specifications.
Parameter
Description
Min. Typ. Ma Units
x.
VCC
Positive Supply Voltage- Noise less than 50mV
4.75 5.0 5.2
V
5
ICC Off Hook Nominal Operating Current when modem is OFF Hook
50 75 mA
ICC On Hook Nominal Operating Current when modem is ON Hook
25 50 mA
ICCPD
VIH
VIL
Power Down Current
High Level Input Voltage*
Low Level Input Voltage*
10 mA
2
V
-0.3
0.8
V
IIN
Input Leakage Current (TXD, DTR, RTS)
15
10
uA
0
ILO
Leakage Current DCD, HS, RXD, SLEEP, DSR
CP
Capacitive Lead (TXT, DTR, RST)
VT+
Positive Hysteresis Threshold for RESET pin
10
uA
10
pF
2.5
V
VT-
Negative Hysteresis Threshold for RESET pin
1.8
V
VOH
High Level (IOH = 0.5mA)*
VOL
Low Level (IOL = 1.6mA)*
2.4
V
0.6
V
Test conditions: VCC = 5V ± 10%, Temp = 0°C to 70°F (unless otherwise stated).
*Output Load = 50 pF ± one TTL.
Parameter
Off Hook Impedance
Table 9. CH1786 Electrical Specifications.
Minimum Typical Maximum Units
20
Ohms
Comments
Trans Hybrid Loss
25
dB
600 Ohm, RXA, TXA
Ring Voltage Loop
Line Loop Current-(Off-
Hook)
Return Loss @ 1000Hz
110V
20
15
250V
100
Vpp
On 48VDC line voltage for
sustained periods
mA
dB
600 Ohm
Ring Frequencies
40
Hz
Receiver Insertion Gain
-0.5
0.0
+0.5
dBm 600 Ohm- Data Mode
Transmit Power
-9.5
dB
First Character After Reset
0.5
1.0
5
sec
Delay
Inter Character Delay
Command Delay
20
50
100
200
msec
msec
Between all command
characters
Between all AT commands
Minimum Reset Pulse
10
Duration
msec If user supplied
2003 Cermetek Microelectronics, Inc.
Page 15
Document No. 607-0004 Revision L1 (06/03)
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