Datasheet
DS34C87T
SNLS376B –MAY 1998–REVISED APRIL 2013
www.ti.com
Switching Characteristics
(1)
V
CC
= 5V ±10%, t
r
, t
f
≤ 6 ns (Figure 3, Figure 4, Figure 5, Figure 6)
Parameter Test Conditions Min Typ Max Units
t
PLH
, t
PHL
Propagation Delay Input to Output S1 Open 6 11 ns
Skew See
(2)
S1 Open 0.5 3 ns
t
TLH
, t
THL
Differential Output Rise And Fall Times S1 Open 6 10 ns
t
PZH
Output Enable Time S1 Closed 12 25 ns
t
PZL
Output Enable Time S1 Closed 13 26 ns
t
PHZ
Output Disable Time
(3)
S1 Closed 4 8 ns
t
PLZ
Output Disable Time
(3)
S1 Closed 6 12 ns
C
PD
Power Dissipation Capacitance
(4)
100 pF
C
IN
Input Capacitance 6 pF
(1) Unless otherwise specified, min/max limits apply across the −40°C to 85°C temperature range. All typicals are given for V
CC
= 5V and
T
A
= 25°C.
(2) Skew is defined as the difference in propagation delays between complementary outputs at the 50% point.
(3) Output disable time is the delay from the control input being switched to the output transistors turning off. The actual disable times are
less than indicated due to the delay added by the RC time constant of the load.
(4) C
PD
determines the no load dynamic power consumption, P
D
= C
PD
V
2
CC f + I
CC
V
CC
, and the no load dynamic current consumption, I
S
= C
PD
V
CC
f + I
CC
.
Comparison Table of Switching Characteristics into “LS-Type” Load
(1)
V
CC
= 5V, T
A
= +25°C, t
r
≤ 6 ns, t
f
≤ 6 ns (Figure 6, Figure 7, Figure 8, Figure 9, Figure 10, Figure 11)
DS34C87 DS3487
Parameter Test Conditions Units
Typ Max Typ Max
t
PLH
, t
PHL
Propagation Delay 6 10 10 15 ns
Input to Output
Skew See
(2)
1.5 2.0 ns
t
THL
, t
TLH
Differential Output Rise 4 7 10 15 ns
and Fall Times
t
PHZ
Output Disable Time C
L
= 50 pF, R
L
= 200Ω, 8 11 17 25 ns
See
(3)
S1 Closed, S2 Closed
t
PLZ
Output Disable Time C
L
= 50 pF, R
L
= 200Ω, 7 10 15 25 ns
See
(3)
S1 Closed, S2 Closed
t
PZH
Output Enable Time C
L
= 50 pF, R
L
= ∞, 11 19 11 25 ns
S1 Open, S2 Closed
t
PZL
Output Enable Time C
L
= 50 pF, R
L
= 200Ω, 14 21 15 25 ns
S1 Closed, S2 Open
(1) This table is provided for comparison purposes only. The values in this table for the DS34C87 reflect the performance of the device but
are not tested or ensured.
(2) Skew is defined as the difference in propagation delays between complementary outputs at the 50% point.
(3) Output disable time is the delay from the control input being switched to the output transistors turning off. The actual disable times are
less than indicated due to the delay added by the RC time constant of the load.
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