AT16244
Fast Logic

16-Bit
Buffer/Line
Driver

AT16244F
AT16244G

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 1.1 ns/100 pF

(G grade)

·
·

Very low ground bounce < 0.6V @ V

=5.00 V, T

=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 Fast Logic 16-Bit Buffer/Line driver provides bus interface and signal buffering
at the fastest speeds available in the industry. The Tri-state outputs can be set for
either 4-bit, 8-bit, or 16-bit independent operation. The AT16244 also has bus-hold
circuitry which retains the last state of the input whenever a high impedance level is
detected, and eliminates the need for pull-up or pull-down resistors. Minimal ground
bounce and high input noise rejection make this device excellent for use in all high
speed interface applications.

Note:

1. The function shown is repeated 3 additional times on each device.

Functional Block Diagram

(1)

1Y2

1Y3

VCC

2Y2

2Y3

3Y1

GND

3Y4

4Y1

GND

4Y4

1A2

1A3

VCC

2A2

2A3

3A1

GND

3A4

4A1

GND

4A4

1A1

GND

1A4

2A1

GND

2A4

3A2

3A3

VCC

4A2

4A3

3OE

1Y1

GND

1Y4

2Y1

GND

2Y4

3Y2

3Y3

VCC

4Y2

4Y3

4OE

Pin Names

Descriptions

xOE

Output Enable Input
(Active Low)

Data Inputs

Tri-State Outputs

Pin Configurations

SSOP/TSSOP

Top View

0755B

AT16244

5-3

Inputs

Outputs

xOE

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

+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

= 0°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)

= V

Input Low Current (I/O Pins)

= GND

Output Leakage Current

(1)

Output High Voltage
F Grade only

= 4.75V

= -10 mA

2.7

(2)

Output High Voltage
G Grade only

= 4.75V

= -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 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

5-4

AT16244

Applicable over recommended operating range from T

= 0°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

5.5

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/100 pF

Note:

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

AC Characteristics
AT16244F

Applicable over recommended operating range from T

= 0°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

5.5

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/100 pF

Note:

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

AT16244G

Pulse

Generator

OUT

D.U.T.

50 pF

500

7.0V

500

Note:

1. Pulse Generator: Rate

1.0 MHz, t

2.5 ns, t

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

= Load capacitance; Includes jig and probe capacitance.

=Termination resistance; Should be equal to Z

OUT

of the

Pulse Generator.

Switch Position

AT16244

5-5

-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

IOL Pull Down Current

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

Ground Bounce for
High to Low Transitions

(1)

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

Supply Bounce for
Low to High Transitions

(2)

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 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 AT16244 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

Typical Values

5-6

AT16244

Part Number AT16244G