Philips Semiconductors Product specification
CBT6820
20-bit bus switch with precharged outputs and
Schottky undershoot protection for live insertion
2000 Jun 19
5
AC CHARACTERISTICS FOR V
CC
= 5.0V ±0.5V RANGE
GND = 0V; t
r
= t
f
≤ 2.5ns; C
L
= 50pF.
LIMITS
SYMBOL PARAMETER WAVEFORM T
amb
= –40 to +85°C UNIT
MIN TYP
1
MAX
t
pd
Propagation delay; An to Bn; Bn to An
2
1 0.25 ns
t
PZH
3-State output enable time
OE to An; OE to Bn; BIASV = GND
2 1.3 3.1 5.3 ns
t
PZL
3-State output enable time
OE to An; OE to Bn; BIASV = 3.0V
2 1.4 2.9 4.6 ns
t
PHZ
3-State output enable time
OE to An; OE to Bn; BIASV = GND
2 1.7 2.8 4.5 ns
t
PLZ
3-State output enable time
OE to An; OE to Bn; BIASV = 3.0V
2 2.8 4.4 6.6 ns
NOTE:
1. All typical values are measured at T
amb
= 25°C and V
CC
= 5.0V
2. Warranted but not production tested. The propagation delay is based on the RC time constant of the typical ON-state resistance of the
switch and a load capacitance of 50pF, when driven by an ideal voltage source (zero output impedance)
AC WAVEFORMS
V
M
= 1.5V, V
IN
= GND to 3.0V
INPUT
1.5V
OUTPUT
t
PLH
t
PHL
SA00028
1.5V
1.5V 1.5V
3 V
0 V
V
OH
V
OL
Waveform 1. Waveforms Showing the Input (An) to Output (Bn)
Propagation Delays
Output Control
(Low-level
enabling
1.5 V
t
PZH
t
PHZ
V
OH
V
OL
t
PZL
t
PLZ
3.5V
0V
V
OL
+ 0.3V
V
OH
– 0.3V
SA00029
1.5 V
1.5 V 1.5 V
0V
3V
Output
Waveform 1
S1 at 7 V
(see Note)
Note:
Waveform 1 is for an output with internal conditions such that
the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that
the output is high except when disabled by the output control.
Output
Waveform 2
S1 at Open
(see Note)
Waveform 2. Waveforms Showing the 3-State Output Enable
and Disable Times
TEST CIRCUIT AND WAVEFORMS
C
L
= 50 pF
500 Ω
Load Circuit
DEFINITIONS
C
L
= Load capacitance includes jig and probe capacitance;
see AC CHARACTERISTICS for value.
TEST S1
t
pd
open
t
PLZ
/t
PZL
7 V
t
PHZ
/t
PZH
open
SA00012
500 Ω
From Output
Under Test
S1
7 V
Open
GND
NOTES:
1. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 10 MHz, Z
O
= 50 Ω, t
r
≤ 2.5 ns, t
f
≤ 2.5 ns.
2. The outputs are measured one at a time with one transition per
measurement.
