SN55976A - 9 通道差动收发器

SN55976A是TI德州仪器公司的一款无产品，SN55976A是9 通道差动收发器，本站介绍了SN55976A的封装应用图解、特点和优点、功能等，并给出了与SN55976A相关的TI元器件型号供参考。

SN55976A - 9 通道差动收发器 - 无 - RS-485收发器 - 德州仪器

产品描述

The SN75976A is an improved replacement for the industry's first 9-channel RS-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.

The patented thermal enhancements made to the 56-pin shrink small-outline package (SSOP) of the SN75976 have been applied to the new, thin shrink, small-outline package (TSSOP). The TSSOP package offers even less board area requirements than the SSOP while reducing the package height to 1 mm. This provides more board area and allows component mounting to both sides of the printed circuit boards for low-profile, space-restricted applications such as small form-factor hard disk drives.

In addition to speed improvements, the '976A can withstand electrostatic discharges exceeding 12 kV using the human-body model, and 600 V using the machine model of MIL-PRF-38535, Method 3015.7 on the RS-485 I/O terminals. This is six times the industry standard and provides protection from the noise that can be coupled into external cables. The other terminals of the device can withstand discharges exceeding 4 kV and 400 V respectively.

Each of the nine channels of the '976A typically meet or exceed the requirements of EIA RS-485 (1983) and ISO8482-1987/TIA TR30.2 referenced by American National Standard of Information (ANSI) Systems, X3.131-1994 (SCSI-2) standard, X2.277-1996 (Fast-20 Parallel Interface), and the Intelligent Peripheral Interface Physical Layer-ANSI X3.129-1986 standard.

The SN75976A is characterized for operation over an ambient air temperature range of 0°C to 70°C. The SN55976A is characterized for operation over an ambient air temperature range of -55°C to 125°C.

产品特性

Improved Speed and Package Replacement for the SN75LBC976
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 Shrink Small-Outline Package with 25-Mil Terminal Pitch (DL) and Thin Shrink Small-Outline Package with 20-Mil Terminal Pitch (DGG)
SN55976A Packaged in a 56-Pin Ceramic Flat Pack (WD)
Two Skew Limits Available
ESD Protection on Bus Terminals Exceeds 12 kV
Low Disabled Supply Current 8 mA Typ
Thermal Shutdown Protection
Positive- and Negative-Current Limiting
Power-Up/Down Glitch Protection

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