74avc16834a NXP Semiconductors, 74avc16834a Datasheet - Page 9

• Manufacturer Part Number: 74avc16834a
• Description: 18-bit Registered Driver With Inverted Register Enable And Dynamic Controlled Outputs 3-state
• Manufacturer: NXP Semiconductors

Philips Semiconductors
TEST CIRCUIT
2002 Sep 11
18-bit registered driver with inverted register enable
and Dynamic Controlled Outputs
GENERATOR
t
t
PLZ/
PHZ/
PULSE
SWITCH POSITION
t
PLH/
TEST
DEFINITIONS
Waveform 7. Load circuitry for switching times
R
C
R
t
L
L
T
t
PZL
PZH
t
= Load resistor
= Load capacitance includes jig and probe capacitance
PHL
= Termination resistance should be equal to Z
Test Circuit for switching times
2
Open
V
GND
I
S
1
R
V
CC
T
D.U.T.
V
CC
2.3–2.7 V
< 2.3 V
3.0 V
V
CC
V
O
C
L
OUT
V
V
V
V
CC
CC
CC
I
of pulse generators.
S
1000
500
500
1
R
R
R
L
L
L
SV01018
2 * V
GND
Open
(3-State)
CC
9
GRAPHS
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
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.
Figure 2. Output voltage (V
Figure 1. Output voltage (V
3.5
2.5
1.5
0.5
3
2
1
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
–250
0
V CC
= 3.3 V
V CC = 1.8 V
50
–200
I OL
I OH
V CC
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
= 2.5 V
100
–150
OL
vs. I
OH
OL
V CC
) vs. output current (I
) vs. output current (I
OL
150
V CC
74AVC16834A
= 2.5 V
–100
and V
= 1.8 V
V CC
OH
= 3.3 V
200
vs. I
–50
OH
Product data
SH00204
SH00205
curves to
250
OL
OH
0
)
)