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SY10E337

SY100E337

Micrel, Inc.

M9999-032206

hbwhelp@micrel.com or (408) 955-1690

FEATURES

s 1500ps max. clock to bus (data transmit)

s 1000ps max. clock to Q (data receive)

s 25

s 50

s Scannable implementation of E336

s Synchronous and asynchronous bus enables

s Non-inverting data path

s Bus outputs feature internal edge slow-down

capacitors

s Additional package ground pins

s Fully compatible with industry standard 10KH,

100K ECL levels

s Internal 75K

s Fully compatible with Motorola MC10E/100E337

s Available in 28-pin PLCC package

3-BIT SCANNABLE

REGISTERED BUS

TRANSCEIVER

DESCRIPTION

The SY10/100E337 are 3-bit registered bus transceivers

with scan designed for use in new, high- performance ECL

drive a 25

for 50

Ω. The bus outputs feature a normal logic HIGH level

emitter-follower is “off”, presenting a high impedance to the

bus. The bus outputs also feature edge slow-down

capacitors.

Both drive and receive sides feature the same logic,

including a loopback path to hold data. The LOAD/HOLD

function is controlled by Transmit Enable (TEN) and Receive

Enable (REN) on the

transmit and receive sides,

respectively, with a HIGH selecting LOAD. The

implementation of the E337 Receive Enable differs from

that of the E336.

A synchronous bus enable (SBUSEN) is provided for

normal, non-scan operation. The asynchronous bus disable

(ABUSDIS) disables the bus for scan mode.

The SYNCEN input allows either synchronous or

asynchronous re-enabling after disabling with ABUSDIS.

An alternative use is asynchronous-only operation with

ABUSDIS, in which case SYNCEN is tied LOW. SYNCEN

is implemented as an overriding SET control to the enable

flip-flop.

Scan mode is selected by a logic HIGH at the SCAN

input. Scan input data is shifted in through S-IN, and output

All registers are clocked on the rising edge of CLK.

Additional lead-frame grounding is provided through the

ground pins (GND) which should be connected to 0V. The

GND pins are not electrically connected to the chip.

SY10E337

SY100E337

Pin

Function

Data Inputs A

Data Inputs B

S-IN

Serial (Scan) Data Input

TEN, REN

LOAD/HOLD Controls

SCAN

Scan Control

ABUSDIS

Asynchronous Bus Disable

SBUSEN

Synchronous Bus Enable

SYNCEN

Synchronous Enable Control

CLK

Clock

25

Ω Cutoff BUS Outputs

SCAN_OUT in scan mode)

PIN NAMES

Rev.: F

Amendment: /0

Issue Date:

March 2006