AT16245
Fast Logic
Bi-Directional
Transceiver
AT16245F
AT16245G
Functional Block Diagram
1DIR
1B2
1B3
VCC
1B6
1B7
2B1
GND
2B4
2B5
GND
2B8
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
1B1
GND
1B4
1B5
GND
1B8
2B2
2B3
VCC
2B6
2B7
2DIR
1
1A2
1A3
VCC
1A6
1A7
2A1
GND
2A4
2A5
GND
2A8
OE
1A1
GND
1A4
1A5
GND
1A8
2A2
2A3
VCC
2A6
2A7
2OE
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/100pF (F grade) and
1.1ns/100pF (G grade)
•
Very Low Ground Bounce <0.6V @ VCC=5.00 V, Ta=25°C
•
Excellent Noise Rejection
•
Typical Output Skew ≤0.25ns
•
Bus Hold Circuitry to Retain Last Active State During Tri-State
•
Available in SSOP and TSSOP Packages
Description
Atmel’s new family of high speed CMOS transceivers offers the best of all worlds to the
user requiring stability and ultra f ast sp eeds. T hese transceivers, which c an function as
two 8-bit devices or one 16-bit device, are capable of improving processing efficiency as
much as 6% by reducing the number of wait states required during memory access. In
addi tion, t his family of par ts has been desig ned to minim ize ground bounce on the out put s
while rejecting input spikes of up to 1.8V and 1 ns wide. This combination of ultra high
speed and low noise is th e next step i n high sp eed performance.
Pin Configurations
Pin Names Descriptions
xOE Output En able Input (Act ive Low)
xDIR Direction Control Input
xA
χ
Side A Inputs or Tri-State Outputs
xB
χ
Side B Inputs or Tri-State Outputs
SSOP/TSSOP
Top View
0754B
AT16245
5-9
Operating Temperature........................0°C to +7 0°C
Storage Temperatur e.............. . .......-65°C to +150°C
Voltage on any Pin
with Re s p e c t to Ground.. .. ............. -2.0 V to + 7 .0 V
(1)
Maxi mu m Op e ra ting Vo l tage..... .........................6.0V
Absolute Maximum Ratings*
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 VCC +0.75V dc which may
overshoot to +7.0V for pulses of less than 20 ns.
5.0 Volt DC C haracteristics
Applicable over recommended operating range from Ta=0°C to +70° C, VCC=+5.0V ±5% (unless otherwise noted)
Symbol Parameter Test Conditio ns Min Typ Max Units
∆I
CC
Quiescent Power Supply Current VCC=Max, VIN=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 (I/O Pins) VIN=V
CC
±15 µA
I
IL
Input Low Current (I/O Pins) VIN= GND ±15 µA
I
OZ
Output Leakage Current ±10 µA
V
OH
(1)
Output High Voltage
F Grade only
VCC=4.75 V
IOH=-10 mA
2.7 V
V
OH
(2)
Output High Voltage
G Grade only
VCC=4.75 V
IOH=-12 mA
2.7
V
V
OL
Output Low Voltage (F Grade) IOL=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 VOH(max)
= 3.75V and at V
CC(min)
, V
OH(max )
= 3.25V
2. G grade: At V
CC(max), the value of VOH(max)
= 3.75V and at V
CC(min)
, V
OH(max )
= 3.35V
Function Table
Inputs
Outputs
xOE xDIR
L L Bus B Data to Bus A
L H Bus A Data to Bus B
HX
(1)
High Z State
Note: 1. X = Don’t Care
5-10
AT16245
AC Characterist ics
AT16245F
Applicable over recommended operating range from Ta=0°C to +70°C, VCC=5.0V ±5% (unless otherwise noted)
Symbol Parameter Test Conditions Min Typ Max Units
t
PHL
t
PLH
Propagation Delay CL=50 pF 2.5 ns
t
PZH
t
PZL
Output Enable Time CL=50 pF 6.0 ns
t
PHZ
t
PLZ
Output Disable Time CL=50 pF 6.0 ns
t
SK
(1)
Output Skew CL=50 pF 0.5 ns
∆t
PHL
(1)
∆t
PLH
Propagation Delay vs Out put Loading 1.3 1.5 ns/100pF
Note: 1. This parameter is guaranteed but not 100% tested.
AT16245G
Applicable over recommended operating range from Ta=0°C to +70°C, VCC=5.0V ±5% (unless otherwise noted)
Symbol Parameter Test Conditions Min Typ Max Units
T
PHL
T
PLH
Propagation Delay CL=50 pF 2.0 ns
T
PZH
T
PZL
Output Enable Time CL=50 pF 6.0 ns
T
PHZ
T
PLZ
Output Disable Time CL=50 pF 5.0 ns
T
SK
(1)
Output Skew CL=50 pF 0.5 ns
∆t
PHL
(1)
∆t
PLH
Propagation Delay vs Out put Loading 0.9 1.1 ns/100pF
Note: 1. This parameter is guaranteed but not 100% tested.
Test Circuits
(1,2)
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.
Switch Position
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.
AT16245
5-11
-40
0
40
80
120
160
Time
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
Output, V
I,mA
OL
2.5
3.0
3.5
4.0
I
OL
Output, V
Typical Values
Parameter Value Units
V
OLP
0.4 V
V
OLV
-0.26 V
V
OHV
VCC - 0.13 V
V
OHP
VCC + 0.6 V
Note: 1. When multiple outputs are switched at the same time, rapidly changing current on the ground and VCC paths cause a voltage to
develop across the parasitic inductance of the wire bond and package pins. This occurrence is called simultaneous
switching noise. Atmel’s AT16245 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
.
VOHP
VOHV
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Time
Volts
vcc measured on
output with
input held
constant
output
3.5
Time
VOLV
VOLP
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Volts
gnd - measured on
output with input
held constant
output
Supply Bounce for Low to High
Transitions
(2)
Ground Bounce for High to Low
Transitions
(1)
IOL Pull Down Curre nt
5-12
AT16245
Control
Input
Enable
Disable
3.0 V
3.5 V
0V
1.5 V
0V
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
Enable an d Disa ble Wavefor ms
(1)
Note: 1. Enable and disable waveforms are the same for both x
OE and xDIR inputs.
Input
Transition
1.5 V 1.5 V
VOH
1.5 V
VOL
Output
Transition
t
PLH
t
PHL
Propagation Delay Wav eforms
AT16245
5-13
Ordering Information
T
PD
Ordering Cod e Package Operation Range
2.5 ns
AT16245F - 25YC
AT16245F - 25XC
48Y
48X
Commercial
2.0 ns
AT16245G - 20YC
AT16245G - 20XC
48Y
48X
Commercial
Package Type
48X
48 Pin, Plastic Thin Shrink Small Outline Package (TSSOP)
48Y
48 Pin, Plastic Shrink Small Outline Package (SSOP)
5-14
AT16245
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