79C940

Specification Number 79C940B-CI (A) Rev C

Page 13 of 13

96

AC CHARACTERISTICS (continued)

Note:

1. Not tested but data available upon request.

No.

Parameter

Symbol

Parameter Description

Test Conditions

Min

Max

IEEE 1149.1 Timing

109

TCK Period, 50% duty cycle (+5%)

100

110

TMS setup to TCK↑

8

111

TDI setup to TCK↑

5

112

TMS hold time from TCK↑

5

113

TDI hold time from TCK↑

10

114

TCK↓ delay to TDO

30

115

TCK↓ delay to SYSTEM OUTPUT

35

10BASE–T Transmit Timing

Min

Max

125

Transmit Start of Idle

250

350

126

Transmitter Rise Time

(10% to 90%)

5.5

127

Transmitter Fall Time

(90% to 10%)

5.5

128

Transmitter Rise and Fall Time Mismatch

1

129

XMT# Asserted Delay

100

130

XMT# De-asserted Delay

TBD

TBD

131

Idle Signal Period

8

24

132

Idle Link Pulse Width

(Note 1)

75

120

133

Predistortion Idle Link Pulse Width

(Note 1)

45

55

134

Transmit Jabber Activation Time

20

150

135

Transmit Jabber Reset Time

250

750

136

Transmit Jabber Recovery Time (Minimum

Time Gap Between Transmitted Packets to

Prevent Jabber Activation)

1.0

10BASE–T Receive Timing

140

RXD Pulse Width Not to Turn Off Internal

Carrier Sense

VIN > VTHS

(min)

136

–

141

RXD Pulse Width to Turn Off VIN> VTHS

(min)

200

142

Receive Start of Idle

200

143

RCV# Asserted Delay

144

RCV# De-asserted Delay

TBD

TBD

TABLE 5

SPECIFICATION NUMBER: 79C940-CI (A) REV -

Page 13 of 13

Rochester Electronics guarantees performance of its semiconductor products to the original OEM specifications. “Typical” values are for reference purposes

only. Certain minimum or maximum ratings may be based on product characterization, design, simulation, or sample testing. Rochester Electronics reserves

the right to make changes without further notice to any specification herein.