TI380C27 Datasheet, PDF (75/77 Pages) Texas Instruments – DUAL-PROTOCOL COMMPROCESSOR

TI380C27
DUAL-PROTOCOL COMMPROCESSOR
SPWS014A – APRIL 1994 – REVISED MARCH 1995
APPLICATION INFORMATION
Figure 40 shows the TI380C27 connected to a LEVEL ONE LXT901™ universal Ethernet interface adapter. The
LXT901 provides all of the active circuitry for interfacing the TI380C27 to the 10 Base-T twisted-pair network.
Texas Instruments TI380C27
Dual-Protocol
Comprocessor
FRAQ / TXD
WRAP / TXEN
PXTALIN / TXC
RCLK / RXC
RCVR / RXD
REDY / CRS
WFLT / COLL
NSRT / LPBK
TEST0
NSELOUT0
1N914
See
Note 10 kΩ
A
Programming
Options
10 kΩ
Remote
Status
Line Status
330 Ω 330 Ω 330 Ω
Green ^Red
Red
5V
See Note D
20 pF
20 MHz
20 pF
0.1 µF
To 10 BASE-T
Twisted-Pair
Network
RJ45
“
TXD
TEN
TCLK
RCLK
RXD
CD
COL
LBK
CLKI
CLKO
TPIN
TPIP
’
1 ^1:1 16
‘
50 Ω

50 Ω
3

14
Ž

LEDC
TPONB
75 Ω ± 1%
1:√2
Œ
TPONA
6
11
37.5 Ω ± 1%
AUTOSEL
NTH
MD0
MD1
TPOPA
UTP
TPOPB
LI
Level One LXT901
RJAB
CIN
RLD
CIP
RCMPT
DON
JAB
DOP
PLR
DIN
PAUI
DIP
LEDR
LEDT/PDN
LADL
VCC1
RBISA
10
8
9
37.5 Ω ± 1%
75 Ω ± 1%
See Note B
12.4 kΩ ± 1%
See Note C
18 pF
VCC2
GND1
GND2
NOTES: A. Half/full duplex selection controlled by TI380C27 pins TEST0 and NSELOUT0.
NSELOUT0 = L (full duplex)
NSELOUT0 = H (half duplex)
For half-duplex operation, diode 1N914 and associate 10-kΩ resistor are not needed: these components can be
removed.
B. Suitable TP transformers include the Fil-Mag 23Z128, and SM23Z128; Valor PT4069 and ST7011; Pulse
Engineering PE65994 and PE65745; Belfuse S553-0716 and A553-0716; and Halo Electronics TD42-2006Q
and TD42-2006W1.
C. RBIAS should be located close to the pin and isolated from other signals.
D. Suitable crystals include the MTRON MP-1 and MP-2.
Figure 40. Typical Schematic for Full-Duplex Operation With the TI380C27
LEVEL ONE LTXT901 is a registered trademark of LEVEL ONE Communications, Inc.
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