AT16245
Fast Logic

Bi-Directional
Transceiver

AT16245F
AT16245G

Functional Block Diagram

1DIR

1B2

1B3

VCC

1B6

1B7

2B1

GND

2B4

2B5

GND

2B8

1B1

GND

1B4

1B5

GND

1B8

2B2

2B3

VCC

2B6

2B7

2DIR

1A2

1A3

VCC

1A6

1A7

2A1

GND

2A4

2A5

GND

2A8

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,

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 @ V

=5.00 V, T

=25

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 fast speeds. These transceivers, which can 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
addition, this family of parts has been designed to minimize ground bounce on the outputs
while rejecting input spikes of up to 1.8V and 1 ns wide. This combination of ultra high
speed and low noise is the next step in high speed performance.

Pin Configurations

Pin Names

Descriptions

xOE

Output Enable Input (Active Low)

xDIR

Direction Control Input

Side A Inputs or Tri-State Outputs

Side B Inputs or Tri-State Outputs

SSOP/TSSOP

Top View

0754B

AT16245

5-9

Operating Temperature ........................ 0

C to +70

Storage Temperature ......................-65

C to +150

Voltage on any Pin
with Respect to Ground................. -2.0 V to +7.0V

(1)

Maximum Operating Voltage..............................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 Characteristics

Applicable over recommended operating range from T

C to +70

C, V

=+5.0V

5% (unless otherwise noted)

Symbol

Parameter

Test Conditions

Min

Typ

Max

Units

Quiescent Power Supply Current

=Max, V

=3.4V

0.8

1.2

Input High Voltage

2.0

Input Low Voltage

0.8

Input High Current (I/O Pins)

Input Low Current (I/O Pins)

= GND

Output Leakage Current

(1)

Output High Voltage
F Grade only

=4.75 V

=-10 mA

2.7

(2)

Output High Voltage
G Grade only

=4.75 V

=-12 mA

2.7

Output Low Voltage (F Grade)

=10 mA

0.55

Output Low Voltage (G Grade)

=12 mA

0.55

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

Bus B Data to Bus A

Bus A Data to Bus B

(1)

High Z State

Note:

1. X = Don't Care

5-10

AT16245

AC Characteristics
AT16245F

Applicable over recommended operating range from T

C to +70

C, V

=5.0V

5% (unless otherwise noted)

Symbol

Parameter

Test Conditions

Min

Typ

Max

Units

PHL

PLH

Propagation Delay

CL=50 pF

2.5

PZH

PZL

Output Enable Time

CL=50 pF

6.0

PHZ

PLZ

Output Disable Time

CL=50 pF

6.0

(1)

Output Skew

CL=50 pF

0.5

PHL

(1)

PLH

Propagation Delay vs Output Loading

1.3

1.5

ns/100pF

Note:

1. This parameter is guaranteed but not 100% tested.

AT16245G

Applicable over recommended operating range from T

C to +70

C, V

=5.0V

5% (unless otherwise noted)

Symbol

Parameter

Test Conditions

Min

Typ

Max

Units

PHL

PLH

Propagation Delay

CL=50 pF

2.0

PZH

PZL

Output Enable Time

CL=50 pF

6.0

PHZ

PLZ

Output Disable Time

CL=50 pF

5.0

(1)

Output Skew

CL=50 pF

0.5

PHL

(1)

PLH

Propagation Delay vs Output 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

2.5 ns,

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:

Load capacitance; Includes jig and probe capacitance.

= Termination resistance; Should be equal to

OUT

of the Pulse Generator.

AT16245

5-11

-40

120

160

Time

-1.0

-0.5

0.0

0.5

1.0

1.5

2.0

Outp

ut, V

2.5

3.0

3.5

4.0

Output, V

Typical Values

Parameter

Value

Units

OLP

0.4

OLV

-0.26

OHV

- 0.13

OHP

+ 0.6

Note:

1. When multiple outputs are switched at the same time, rapidly changing current on the ground and V

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

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

VOHP

VOHV

0.5

1.5

2.5

3.5

4.5

Time

l
t
s

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

olts

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 Current

5-12

AT16245

Control

Input

Enable

Disable

3.0 V

3.5 V

0 V

1.5 V

0 V

0.3 V

1.5 V

Switch Open

Switch Closed

1.5 V

Output

Switched

Low

Output

Switched

High

PZL

PZH

PLZ

PHZ

Enable and Disable Waveforms

(1)

Note:

1. Enable and disable waveforms are the same for both xOE and xDIR inputs.

Input

Transition

1.5 V

VOH

1.5 V

VOL

Output

Transition

PLH

PHL

Propagation Delay Waveforms

AT16245

5-13

Part Number AT16245