1FEATURES
· Controlled Baseline
– One Assembly Site
– One Test Site
– One Fabrication Site
· Extended Temperature Performance of –55°C
to 125°C
· Enhanced Diminishing Manufacturing Sources
(DMS) Support
· Enhanced Product-Change Notification
· Qualification Pedigree (1)
· Designed to Operate at up to 20 Million Data
Transfers per Second (Fast-20 SCSI)
· Nine Differential Channels for the Data and
Control Paths of the Small Computer Systems
Interface (SCSI) and Intelligent Peripheral
Interface (IPI)
· SN75976A Packaged in Thin Shrink
Small-Outline Package with 20-Mil Terminal
Pitch (DGG)
· Two Skew Limits Available
· ESD Protection on Bus Terminals Exceeds
12 kV
· Low Disabled Supply Current 8 mA Typical
· Thermal Shutdown Protection
· Positive and Negative Current Limiting
· Power-Up/Down Glitch Protection

DESCRIPTION/ORDERING INFORMATION
The SN75976A is an improved replacement for the industry's first 9-channel 485 transceiver – the SN75LBC976.
The A version offers improved switching performance, a smaller package, and higher ESD protection. The
SN75976A is offered in two versions. The '976A2 skew limits of 4 ns for the differential drivers and 5 ns for the
differential receivers complies with the recommended skew budget of the Fast-20 SCSI standard for data transfer
rates up to 20 million transfers per second. The '976A1 supports the Fast SCSI skew budget for 10 million
transfers per second. The skew limit ensures that the propagation delay times, not only from channel-to-channel
but from device-to-device, are closely matched for the tight skew budgets associated with high-speed parallel
data buses.