AT16373
Fast Logic
TM
TM
16-Bit
Transparent
Latch
AT16373F
AT16373G
Features
·
·
Fastest Propagation Speeds in the Industry T
PD (F grade)
= 2.5 ns, T
PD (G grade)
= 2.0 ns
·
·
Maximum derating for capacitive loads 1.5ns/100 pF (F grade) and 1.1ns/100 pF
(G grade)
·
·
Very low ground bounce < 0.6V @ V
CC
=5.00V, T
a
=25°C
·
·
Excellent noise rejection
·
·
Typical output skew
0.25ns
·
·
Bus Hold circuitry to retain last active state during Tri-state
TM
TM
·
Available in SSOP and TSSOP packages
Description
Atmel's AT16373 devices provide maximum speed in temporary data storage. They
can be operated as either two separate 8 bit latches or as a single 16-bit latch by use
of the output enable and the latch enable. The AT16373 has very low ground bounce
and excellent input noise rejection, giving the user stable signals in a high speed
environment. These devices can drive very large loads while operating in a high speed
transparent mode.
Note: 1. This 8-bit latch function is repeated a second time on each device.
Functional Block Diagram
(1)
1
1O2
1O3
VCC
1O6
1O7
2O1
GND
2O4
2O5
GND
2O8
OE
1
3
5
7
9
11
13
15
17
19
21
23
47
45
43
41
39
37
35
33
31
29
27
25
48
46
44
42
40
38
36
34
32
30
28
26
2
4
6
8
10
12
14
16
18
20
22
24
1O1
GND
1O4
1O5
GND
1O8
2O2
2O3
VCC
2O6
2O7
2OE
1LE
1D2
1D3
VCC
1D6
1D7
2D1
GND
2D4
2D5
GND
2D8
1D1
GND
1D4
1D5
GND
1D8
2D2
2D3
VCC
2D6
2D7
2LE
Pin Names
Descriptions
xOE
Output Enable Input
(Active Low)
xLE
Latch Enable Inputs
(Active High)
xD
Data Inputs
xO
Tri-State Outputs
Pin Configurations
SSOP/TSSOP
Top View
0756B
AT16373
5-15
Inputs
Outputs
xD
xLE
xOE
xO
H
H
L
H
L
H
L
L
X
X
H
Z
Note: 1. X = Don't Care, Z = High Impedance
Function Table
(1)
Operating Temperature........................ 0°C to +70°C
Storage Temperature ...................... -65°C to +150°C
Voltage on any Pin
with Respect to Ground .................. -2.0V to +7.0V
(1)
Maximum Operating Voltage ............................. 6.0V
*NOTICE: Stresses beyond those listed under "Absolute
Maximum Ratings" may cause permanent damage to
the device. This is a stress rating only and functional
operation of the device at these or any other conditions
beyond those indicated in the operational sections of
this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may
affect device reliability.
Notes: 1. Minimum voltage is -0.6V dc which may undershoot
to -2.0V for pulses of less than 20 ns. Maximum
output pin voltage is V
CC
+0.75V dc which may
overshoot to +7.0V for pulses of less than 20 ns.
Absolute Maximum Ratings*
Applicable over recommended operating range from T
a
= 0°C to +70°C, V
CC
= +5.0V +/- 5% (unless otherwise noted)
Symbol
Parameter
Test Conditions
Min
Typ
Max
Units
I
CC
Quiescent Power Supply
Current
V
CC
= Max, V
IN
= 3.4V
0.8
1.2
mA
V
IH
Input High Voltage
2.0
V
V
IL
Input Low Voltage
0.8
V
I
IH
Input High Current
V
IN
= V
CC
±
15
µ
A
I
IL
Input Low Current
V
IN
= GND
±
15
µ
A
I
OZ
Output Leakage Current
±
10
µ
A
V
OH
(1)
Output High Voltage
F Grade only
V
CC
= 4.75V
I
OH
= -10 mA
2.7
V
V
OH
(2)
Output High Voltage
G Grade only
V
CC
= 4.75V
I
OH
= -12 mA
2.7
V
V
OL
Output Low Voltage (F Grade)
I
OL
= 10 mA
0.55
V
V
OL
Output Low Voltage (G Grade)
I
OL
= 12 mA
0.55
V
Note: 1. F grade: At V
CC (max)
, the value of V
OH(max)
= 3.75V and at V
CC(min)
, V
OH(max)
= 3.25V
2. G grade: At V
CC (max)
, the value of V
OH(max)
= 3.75V and at V
CC(min)
, V
OH(max)
= 3.35V
5.0 Volt DC Characteristics
5-16
AT16373
Applicable over recommended operating range from T
a
= 0°C to +70°C, V
CC
= 5.0V +/- 5% (unless otherwise noted)
Symbol
Parameter
Test Conditions
(1)
Min
Typ
Max
Units
t
PHL
t
PLH
Propagation Delay xD
to xO
C
L
= 50 pF
2.5
ns
t
PHL
t
PLH
Propagation Delay xLE to xO
C
L
= 50 pF
5.5
ns
t
PZH
t
PZL
Output Enable
C
L
= 50 pF
8.8
ns
t
PHZ
t
PLZ
Output Disable
C
L
= 50 pF
6.5
ns
t
SK
(2)
Output Skew
CL = 50 pF
0.5
ns
t
PHL
(2)
t
PLH
Propagation Delay vs Output Loading
1.3
1.5
ns/100 pF
t
su
Set-up Time
C
L
= 50 pF
2.0
ns
t
H
Hold Time
C
L
= 50 pF
2.0
ns
Note: 1. See test circuit and waveforms.
2. This parameter is guaranteed but not 100% tested.
AC Characteristics
AT16373F
Applicable over recommended operating range from T
a
= 0°C to +70°C, V
CC
= 5.0V +/- 5% (unless otherwise noted)
Symbol
Parameter
Test Conditions
(1)
Min
Typ
Max
Units
t
PHL
t
PLH
Propagation Delay xD
to xO
C
L
= 50 pF
2.0
ns
t
PHL
t
PLH
Propagation Delay xLE to xO
C
L
= 50 pF
5.0
ns
t
PZH
t
PZL
Output Enable
C
L
= 50 pF
8.8
ns
t
PHZ
t
PLZ
Output Disable
C
L
= 50 pF
6.0
ns
t
SK
(2)
Output Skew
C
L
= 50 pF
0.5
ns
t
PHL
(2)
t
PLH
Propagation Delay vs Output Loading
0.9
1.1
ns/100 pF
t
su
Set-up Time
C
L
= 50 pF
2.0
ns
t
H
Hold Time
C
L
= 50 pF
2.0
ns
Note: 1. See test circuit and waveforms.
2. This parameter is guaranteed but not 100% tested.
AT16373G
AT16373
5-17
-40
0
40
80
120
160
Time
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
Outp
ut, V
I,
m
A
OL
2.5
3.0
3.5
4.0
I
OL
Output, V
IOL Pull Down Current
Pulse
Generator
V
IN
V
OUT
D.U.T.
V
CC
R
T
C
L
50 pF
500
7.0V
500
Note: 1. Pulse Generator: Rate
1.0 MHz, t
F
2.5 ns,
t
R
2.5 ns.
2. AC tests are done with a single bit switching, and
timings need to be derated when multiple outputs
are switching in the same direction simultaneously.
This derating should not exceed 0.5 ns for 16 inputs
switching simultaneously.
Test Circuits
(1,2)
Test
Switch
Open Drain
Disable Low
Enable Low
Closed
All Other Tests
Open
Definitions:
C
L
= Load capacitance; Includes jig and probe capacitance.
R
T
= Termination resistance; Should be equal to Z
OUT
of the
Pulse Generator.
Switch Position
3.5
Time
VOLV
VOLP
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
V
olts
gnd - measured on
output with input
held constant
output
Ground Bounce for High to Low
Transitions
(1)
VOHP
VOHV
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Time
Vo
l
t
s
vcc -
measured on
output with
input held
constant
output
Supply Bounce for Low to High
Transitions
(2)
5-18
AT16373
Parameter
Value
Units
V
OLP
0.4
V
V
OLV
-0.26
V
V
OHV
V
CC
- 0.13
V
V
OHP
V
CC
+ 0.6
V
Note: 1. When multiple outputs are switched at the same time, rapidly changing current on the ground and VCC paths
causes a voltage to develop across the parasitic inductance of the wire bond and package pins. This occurrence
is called simultaneous switching noise. Atmel's AT16373 products have minimized this phenomenon as shown on
the graph. Output data is for 15 outputs switching simultaneously at a frequency of 1 MHz. The ground data is
measured on the one remaining output, which is set to logic low and will reflect any device ground movement.
2. As on the graph for Ground Bounce, a similar condition occurs for low to high transitions. Output data is for 15 outputs
switching simultaneously at a frequency of 1 MHz. V
CC
droop is measured on the one remaining output pin, which is
set to a logic high. This output will reflect any movement on the device V
CC
.
Typical Values
Input
Transition
1.5 V
1.5 V
VOH
1.5 V
VOL
Output
Transition
t
PLH
t
PHL
Propagation Delay Waveforms
Control
Input
Enable
Disable
3.0 V
3.5 V
0 V
1.5 V
0 V
0.3 V
0.3 V
1.5 V
Switch Open
Switch Closed
1.5 V
Output
Switched
Low
Output
Switched
High
t
PZL
t
PZH
t
PLZ
t
PHZ
V
OL
V
OH
Note: 1. Enable and disable waveforms are the same for both xOE and xLE inputs.
Enable and Disable Waveforms
(1)
AT16373
5-19
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