PI2BV3877 Datasheet, PDF (3/4 Pages) Pericom Semiconductor Corporation – 2-Port 266 MHz DDR BusSwitch

PI2BV3877
2.5V, 10-Bit, 2-Port
266 MHz DDR BusSwitch _{1122334455667788990011223344556677889900112233445566778899001122112233445566778899001122334455667788990011223344556677889900112211223344556677889900112233445566778899001122334455667788990011221122334455667788990011223344556677889900112233445566778899001122112233445566778899001122}
Switching Characteristics over Operating Range
PI2BV3877
Parameters
Description
Conditions^(2,3)
Com.
Units
t_PLH
Propagation Delay^(2,3)
t_PHL
Ax to Bx, Bx to Ax
Min. Max.
1
t_PZH
Bus Enable Time
C_L = 30pF,
1
3
t_PZL
BE to Ax or Bx
R_L = 500Ω,
R = 500Ω
1
3.5
ns
t_PHZ
Bus Disable Time
t_PLZ
BE to Ax or Bx
1
3
1
3.8
Notes:
1. See test circuit and waveforms.
2. This parameter is guaranteed but not tested on Propagation Delays.
3. The bus switch contributes no propagational delay other than the RC delay of the ON resistance of the switch and the load capacitance. The time
constant for the switch alone is of the order of 1ns for 50pF load. Since this time constant is much smaller than the rise/fall times of typical driving
signals, it adds very little propagational delay to the system. Propagational delay of the bus switch when used in a system is determined by the
driving circuit on the driving side of the switch and its interaction with the load on the driven side.
Parameter Measurements
From Output
Under Test
C_L = 30pF
(See note 1)
500Ω
500Ω
2xVCC
S1
Open
GND
Test
t_PD
t_PLZ/t_PZL
t_PHZ/t_PZH
S1
Open
2xV_CC
GND
LOAD CIRCUIT
Input
tPLH
V_CC/2
V_CC/2
tPHL
V_CC
0V
Output
V_CC/2
VOH
V_CC/2
VOL
Output
Control
(Low Level
Enabling)
Output
Waveform 1
S1 at 2xVCC
(see Note 2)
Output
Waveform 2
S1 at GND
(see Note 2)
tPZL
tPZH
VCC/2
VCC/2
VCC/2
VCC/2
tPLZ
VCC
0V
VOH
VOL +0.15V _VOL
tPHZ
VOH
VOH -0.15V
0V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
Notes:
1. C_L includes probe and jig capacitance.
2. 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.
3. All input pulses are supplied by generators having the following characteristics: PRR<10MHz, Z_O = 50Ω, t_R ≤ 2ns, t_F ≤ 2ns.
4. The outputs are measured one at a time with one transition per measurement.
5. t_PLZ and t_PHZ are the same as t_DIS.
6. t_PZL and t_PZH are the same as t_EN.
7. t_PLH and t_PHL are the same as t_PD.
3
PS8472A 05/02/00