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Texas Instruments 4Q 2006 Interface Selection Guide
Parameter Name SN74VMEH22501 SN74VMEH2501A
Voltage Nodes (V) 3.3 3.3
V
CC
Range (V) 3.15 to 3.45 3.15 to 3.45
Input Level LVTTL LVTTL
Output Level LVTTL LVTTL
Output Drive (mA) –48/64 –48/64
No. of Outputs 10 10
Logic True True
Static Current (mA) 30 30
t
pd
max (ns) 8.9 8.9
T
A
0° C to 85° C –40° C to 85° C
VME Parametric Table
Design Considerations
Backward compatibility — The VMEH22501/A
improves the performance up to 8X of the
VMEbus™ without making changes to
existing hardware.
Standard Specification — The VMEH22501/A
are referenced by the 2eSST VITA 1.5 spec
as a device that provides excellent signaling
at 40-Mbps data rate.
Increased Noise Immunity — The ±50-mV input
threshold allows the VMEH22501/A to provide
clean signaling under harsh environments.
Full Live Insertion—This device is fully
s
pecified for live-insertion applications using
I
O
FF
,
power-up 3-state and BIAS V
C
C
.
Speed/Signal Integrity—High-speed
backplane operation is a direct result of the
improved OEC circuitry that has been tested
on the standard VME backplane. Furthermore,
signal integrity is not compromised with
higher speed operation.
Technical Information
• TI’s SN74VMEH22501/A are specifically
designed for the VMEbus technology. The
device is an 8-bit universal bus transceiver
(UBT) with two bus transceivers. It
provides incident switching on the 21-slot
VMEbus backplane, thus providing data
signaling rates of up to 40 Mbps-—an 8X
improvement over the VME64 standard.
Highlights
• Ability to transmit data on the VMEbus
up to 2eSST protocol speed is an
improvement over VME64.
• Incident wave switching allows for higher
performance on the VMEbus compared to
conventional logic that depends on
reflective wave switching.
Literature Number Description
Application Notes
SCEA028 VMEH22501 in 2eSST and Conventional VME Backplane Applications
Other Literature
SCYB009 VME Application Clip
Resources For a complete list of resources (evaluation modules, data sheets and application notes), visit interface.ti.com
VME
41
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