参数资料
型号: SN74SSTL16847
厂商: Texas Instruments, Inc.
英文描述: 20-Bit SSTL_3 Interface Buffer With 3-State Outputs
中文描述: 具有三态输出的 20 位 SSTL_3 接口缓冲器
文件页数: 5/6页
文件大小: 88K
代理商: SN74SSTL16847
SN74SSTL16847
20-BIT SSTL_3 INTERFACE BUFFER
WITH 3-STATE OUTPUTS
SCBS709A – OCTOBER 1997 – REVISED MAY 1998
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
th
tsu
LOAD CIRCUIT
VREF
VIH
VIL
§
VREF
VREF
VIH
VIL
§
VIH
VIL
§
VREF
tw
Input
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
VOLTAGE WAVEFORMS
PULSE DURATION
Output
Waveform 1
(see Note B)
Output
Waveform 2
(see Note B)
VOL
VOH
tPZL
tPZH
tPLZ
tPHZ
VREF
VREF
VTT
VIL
§
VIL
§
VIH
VTT
VIH
Output
Control
tPLH
tPHL
VREF
VREF
VIH
VIL
§
VREF
VREF
VOH
VOL
Input
Output
25
= SSTL_3 Class II
50
= SSTL_3 Class I
CL = 10 pF or 30 pF
(see Note A)
Test
Point
VTT
VREF
25
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
VIL
§
VIH
VREF = 0.45 VDDQ
VIH = VREF+400mV (AC voltage levels)
§VIL = VREF–400mV (AC voltage levels)
NOTES: A. CL includes probe and jig capacitance.
B. 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.
C. All input pulses are supplied by generators having the following characteristics: PRR
10 MHz, ZO = 50
, tr
1.25 ns/V,
tf
1.25 ns/V.
D. The outputs are measured one at a time with one transition per measurement.
E. VTT = VREF = VDDQ X 0.45
F. tPLZ and tPHZ are the same as tdis.
G. tPZL and tPZH are the same as ten.
H. tPLH and tPHL are the same as tpd.
Timing
Input
Data
Input
Figure 1. Load Circuit and Voltage Waveforms
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