Micrel, Inc.
SWITCHING WAVEFORM
2.5 ± 0.3 ns
INPUT
tPHL
80%
50%
2.5 ± 0.3 ns
20%
tPLH
COMPLEMENT
50%
tPLH
TRUE
tTLH
tPHL
80%
50%
20%
tTHL
Figure 1. Propagation Delay and Transition Times
Note:
VEE = –4.2V to –5.5V unless otherwise specified, VCC = VCCA = GND, VTTL = +4.5V to +5.5V
TEST CIRCUIT
VIH
VTTL
0.1µF
0.1µF 0.1µF
+3.0V
+1.5V
0V
SY100S324
L1
L2
SCOPE
CHAN A
RT
L3
PULSE
GENERATOR
0.1µF
2.5µF
VEE
VCC
Notes:
VCC, VCCA = +2V, VEE = –2.5V, VTTL = +7.0V, VIH = +6.0V
L1, L2 and L3 = equal length 50Ω impedance lines
RT = 50Ω terminator internal to scope
Decoupling 0.1µF from GND to VCC, VEE and VTTL
All unused outputs are loaded with 50Ω to GND
CL = Fixture and stray capacitance ≤ 3pF
Figure 2. AC Test Circuit
M9999-061306
hbwhelp@micrel.com or (408) 955-1690
4
SCOPE
CHAN B
RT