參數(shù)資料
型號(hào): 74AVC16334A
英文描述: 16-bit registered driver with inverted register enable and Dynamic Controlled Outputs(tm) (3-State)
中文描述: 帶反相寄存使能和動(dòng)態(tài)控制輸出3態(tài)16位寄存驅(qū)動(dòng)器
文件頁(yè)數(shù): 8/10頁(yè)
文件大?。?/td> 102K
代理商: 74AVC16334A
Philips Semiconductors
Product specification
74AVC16334A
16-bit registered driver with inverted register enable and
Dynamic Controlled Outputs
(3-State)
2000 Aug 03
8
TEST CIRCUIT
SWITCH POSITION
PULSE
GENERATOR
R
T
V
I
D.U.T.
V
O
C
L
V
CC
R
L
Test Circuit for switching times
Open
GND
S
1
DEFINITIONS
R
L
= Load resistor
C
L
= Load capacitance includes jig and probe capacitance
R
T
= Termination resistance should be equal to Z
OUT
of pulse generators.
V
CC
V
I
< 2.3 V
V
CC
TEST
S
1
t
PLH/
t
PHL
Open
2
V
CC
t
PLZ/
t
PZL
V
CC
2.3–2.7 V
t
PHZ/
t
PZH
GND
R
L
2 * V
CC
SV01018
R
L
1000
500
V
CC
3.0 V
500
Waveform 7.
Load circuitry for switching times
GRAPHS
SH00204
0
0.5
1
1.5
2
2.5
3
3.5
0
50
100
150
200
250
OUTPUT CURRENT (mA)
O
V
= 3.3 V
VCC
= 2.5 V
VCC
VCC = 1.8 V
IOL
Figure 1. Output voltage (V
OL
) vs. output current (I
OL
)
SH00205
–250
–200
–150
–100
–50
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
= 3.3 V
= 2.5 V
= 1.8 V
OUTPUT CURRENT (mA)
O
V
VCC
IOH
VCC
VCC
Figure 2. Output voltage (V
OH
) vs. output current (I
OH
)
A Dynamic Controlled Output (DCO) circuit is designed in. During
the transition, it initially lowers the output impedance to effectively
drive the load and, subsequently, raises the impedance to reduce
noise. Figures 1 and 2 show V
OL
vs. I
OL
and V
OH
vs. I
OH
curves to
illustrate the output impedance and drive capability of the circuit. At
the beginning of the signal transition, the DCO circuit provides a
maximum dynamic drive that is equivalent to a high drive standard
output device.
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