DS34C87T
SNLS376B –MAY 1998–REVISED APRIL 2013
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Switching Characteristics(1)
VCC = 5V ±10%, t r, tf≤6 ns (Figure 3,Figure 4,Figure 5,Figure 6)
Parameter Test Conditions Min Typ Max Units
tPLH, tPHL Propagation Delay Input to Output S1 Open 6 11 ns
Skew See(2) S1 Open 0.5 3 ns
tTLH, tTHL Differential Output Rise And Fall Times S1 Open 6 10 ns
tPZH Output Enable Time S1 Closed 12 25 ns
tPZL Output Enable Time S1 Closed 13 26 ns
tPHZ Output Disable Time(3) S1 Closed 4 8 ns
tPLZ Output Disable Time(3) S1 Closed 6 12 ns
CPD Power Dissipation Capacitance(4) 100 pF
CIN 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 VCC = 5V and
TA= 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) CPD determines the no load dynamic power consumption, PD= CPD V2CC f + ICC VCC, and the no load dynamic current consumption, IS
= CPD VCC f + ICC.
Comparison Table of Switching Characteristics into “LS-Type” Load(1)
VCC = 5V, TA= +25°C, tr≤6 ns, tf≤6 ns (Figure 6,Figure 7,Figure 8,Figure 9,Figure 10,Figure 11)
DS34C87 DS3487
Parameter Test Conditions Units
Typ Max Typ Max
tPLH, tPHL Propagation Delay 6 10 10 15 ns
Input to Output
Skew See(2) 1.5 2.0 ns
tTHL, tTLH Differential Output Rise 4 7 10 15 ns
and Fall Times
tPHZ Output Disable Time CL= 50 pF, RL= 200Ω, 8 11 17 25 ns
See(3) S1 Closed, S2 Closed
tPLZ Output Disable Time CL= 50 pF, RL= 200Ω, 7 10 15 25 ns
See(3) S1 Closed, S2 Closed
tPZH Output Enable Time CL= 50 pF, RL=∞, 11 19 11 25 ns
S1 Open, S2 Closed
tPZL Output Enable Time CL= 50 pF, RL= 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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