
Micrel, Inc.
TTL SWITCHING CIRCUIT
USE 0.1µF CAPACITORS
FOR DECOUPLING.
PULSE
GENERATOR
50Ω COAX
VEE
VCC & VCCO
PECL
IN
DEVICE
UNDER
TEST
TTL
OUT
450Ω
50Ω COAX
50Ω COAX
USE OSCILLOSCOPE
INTERNAL 50Ω LOAD
FOR TERMINATION.
CH A
CH B
OSCILLOSCOPE
ECL/TTL PROPAGATION DELAY — SINGLE ENDED
50%
VIN
Tpd++
VOUT
1.5V
Tpd– –
ECL/TTL WAVEFORMS: RISE AND FALL TIMES
VOUT
Trise
2.0V
0.8V
Tfall
Precision Edge®
SY10H842L
SY100H842L
M9999-102606
hbwhelp@micrel.com or (408) 955-1690
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