3

SCDCT1775 Rev B

VALUES AT NOMINAL POWER SUPPLY VOLTAGES UNLESS OTHERWISE SPECIFIED

PARAMETER

VALUE

UNITS

Receiver

Differential Input Impedance

(DC to 1MHz)

4 min

K

Ω

Differential Input Voltage

40 max

Input Threshold (Direct Coupled)

1 typ

CMRR (DC to 2MHZ)

40 min

dB

CMV (DC to 2MHZ)

±10 min

V

RX STROBE Characteristics

1 typ

TTL Loads

Transmitter

Differential Output Voltage

Direct Coupled (across 145

Ω Load)

30 typ

Transformer Coupled (at stub)

21 typ

Output Rise and Fall time

130 typ

ns

Output Noise

10 max

TX INHIBIT Characteristics

1 typ

TTL Loads

Logic

See pin function &

loading Table

2.5 min

V

0.4 max

V

2.0 min

V

0.7 max

V

Clock

Supply

-0.3 min

V

Ground

+0.3 min

V

Supply

-0.5 min

V

Ground

+0.5 min

V

Power Supplies

+5V OSC/CLOCK Supply

Voltage Tolerances

±10

%

Current Drain

8 typ; 13 max

mA

+5V Logic Supply

Voltage Tolerances

±10

%

Current Drain

250 max

mA

+15V (or +12V) Supply

Voltage Tolerances

±5

%

Current Drain

65 max

mA

-15V Supply

Voltage Tolerances

±5

%

Current Drain

Idle

65 max

mA

25% Transmit

105 max

mA

100% Transmit

250 max

mA

-12V Supply

Voltage Tolerances

±5

%

Current Drain

Idle

65 max

mA

25% Transmit

105 max

mA

100% Transmit

250 max

mA

Temperature Range

Operating (Case)

−55 to +125

°C

Storage

−65 to +150

°C

Physical Characteristics

Size

68 pin DDIP

1.6 x 1.9 x 0.18

in

TABLE 1 – CT1775 SPECIFICATIONS