Oki TF-300P, Руководство по обслуживанию на месте

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6-15
Parameter Symbol Min. Typ. Max. Units Test Condition
Output High Voltage VOH V
Type OA and OB 3.5 - - ILOAD= -100
£ g
A
Type OE 2.4 - - ILOAD= -40
£ g
A
Output High Current
Types OD
IOH - - -0.1 m A
Output Low Voltage VOL Vdc
Types OA and OC - - 0.4 ILOAD= 1.6 mA
Types OB - - 0.4 ILOAD= 0.8 mA
Types OE - - 0.4 ILOAD= 0.4 mA
Output Low Current
Types OD
IOL - - 100
£ g
A
Output Leakage Current ILO
£ g
A VIN= 0.4 to Vcc-1
Type OA and OB - -
¡ Ó
10
Capacitor Load CL pF
Type IA and ID - 5 -
Type IB - 20 -
Capacitor Drive CD pF
Type OA, OB, OC
Types OD
-
-
100
50
-
Circuit Type
Type IA TTL
Type IB TTL with pull-up
Type IC CMOS with pull-up
Type ID POR
Type OA and OB TTL with 3-state
Type OC and OE Open drain
Type OD Clock
The modem (R96DFXL) must be connected to an external crystal circuit consisting of a
24.00014MHz crystal and two capacitors. The analog power and ground are decoupled from +5V
and digital ground by bead cores. Power-on reset
/PORI is provided by FC200(-M). Output of
received analog signal is available on pin VOICE and is multiplexed with signal TONE before input
to audio amplifier U18B. TXA, RXA, U18B, U18C, U18D is used to adjust the volume of voice. RXA
have to be amplified and modified voltage level according to this signal is different from modem
characteristics.