SIS Documentation
SIS3800
Scaler/Counter
Page 23 of 39
12.3 TTL
The TTL input level option is possible with LEMO and flat cable connectors.
12.3.1 TTL/LEMO
The (low active) TTL/LEMO input circuitry is sketched below. A high active version can be
implemented by replacing the 74F245 with a 74F640
12.3.2 TTL/Flat Cable
In the flat cable TTL version the positive (right hand side) of the connector is tied to ground.
13 Connector Specification
The four different types of front panel and VME connectors used on the SIS360x and
SIS38xx boards are:
Connector
Purpose
Part Number
160 pin zabcd
VME P1/P2
Harting 02 01 160 2101
20 pin header
Control (flat cable versions)
DIN41651 20 Pin (AMP e.g.)
34 pin header
Inputs (flat cable versions)
DIN41651 34 Pin (AMP e.g.)
LEMO
Control and Input (LEMO versions)
LEMO ERN.00.250.CTL
5 V
1 K
245
5 V
1 K
245
-
+
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