FX949 Datasheet, PDF (20/25 Pages) CML Microcircuits – CDPD Wireless Modem Data Pump

CDPD Wireless Modem Data Pump
Operating Characteristics
For the following conditions unless otherwise specified:
Xtal Frequency = 4.9152MHz, Bit Rate = 19.2k bits/sec,
V_DD = 3.3V to 5.0V, Tamb = -40°C to +85°C.
DC Parameters
I_DD (powersaved)
I_DD (all enabled)
I_DD (powersaved)
I_DD (all enabled)
(V_DD = 5.0V)
(V_DD = 5.0V)
(V_DD = 3.0V)
(V_DD = 3.0V)
AC Parameters
Tx Output
Tx O/P Impedance (Tx enabled)
Tx O/P Impedance (powersaved)
Output Signal Level
Power up to Tx O/P Stable
Notes
1, 10
1, 10
1, 10
1, 10
Min.
2
2
300
7
0.9
8
Rx Input
Rx I/P Impedance (at 100Hz)
10
Rx I/P Amp Voltage Gain (I/P = 1mVrms at 100Hz)
Input Signal Level
9
0.7
Xtal/Clock Input
'High' Pulse Width
'Low' Pulse Width
Input Impedance (at 100Hz)
Gain (I/P = 1mV rms at 100Hz)
3
40
3
40
10
20
µP Interface
Input Logic "1" Level
Input Logic "0" Level
Input Leakage Current (Vin = 0 to V_DD)
Input Capacitance
Output Logic "1" Level (l_OH = 120µA)
Output Logic "0" Level (l_OL = 360µA)
'Off' State Leakage Current (Vout = V_DD)
4, 5 70%
4, 5
4, 5
−5.0
4, 5
5
90%
5, 6
6
Typ.
1.3
5.0
0.5
2.0
1.0
500
1.0
3
500
1.0
10.0
FX949
Max.
2.0
7.0
1.0
3.0
Units
mA
mA
mA
mA
2.5
kΩ
kΩ
1.1
Vpk-pk
5
bits
MΩ
V/V
1.3
Vpk-pk
ns
ns
MΩ
dB
30%
+5.0
10%
10
V_DD
V_DD
µA
pF
V_DD
V_DD
µA
Notes:
1. Not including any current drawn from the modem pins by external circuitry.
2. Small signal impedance, at V_DD = 5.0V and Tamb = 25°C.
3. Timing for an external input to the CLOCK/XTAL pin.
4. WRN, RDN, CSN, A0 - A6 pins.
5. D0 - D7 pins.
6. IRQN pin.
7. For 1111000011110000.. bit sequence, at V_DD = 5.0V and Tamb = 25°C.
(output level is proportional to V_DD).
8. Measured between setting PSTX to "'0" and TXSIGNAL becoming stable.
9. For optimum performance, measured at RX SIGNAL FEEDBACK pin,
for a '...11110000...' bit sequence, at V_DD = 5.0V and Tamb = 25°C.
10. At Tamb = 25°C only.
© 1996 Consumer Microcircuits Limited
20
D/949/5