Typical pin
Pin
No.
Symbol voltage
DC AC
33 SD-TTL
VEE
or
VEE +
3V
34 SDB-TTL
VEE
or
VEE +
3V
35 SD-ECL
–0.9V
or
–1.7V
36 SDB-ECL
–0.9V
or
–1.7V
CXB1577Q
Equivalent circuit
VCC4
33
40k
VEE4
VCC4
Description
Alarm signal TTL level output.
34
40k
VEE4
Alarm signal TTL level output.
VCC3
Alarm signal ECL level output.
Terminate this pin in 510Ω to VEE
35
at VEE = 5V; in 270Ω to VEE at VEE
36
= 3.3V.
VEE3
–6–