NE8392C NXP Semiconductors, NE8392C Datasheet - Page 5

• Manufacturer Part Number: NE8392C
• Description: Coaxial Transceiver Interface For Ethernet/thin Ethernet
• Manufacturer: NXP Semiconductors

1. All typicals are for V
2. Measured on secondary side of isolation transformer (see Figure 1, Connection Diagram). The transformer has a 1:1 turn ratio with an
3. The rise and fall times are measured as the time required for the differential voltage to change from –225mV to +225mV, or +225mV to
4. Difference in propagation delay between rising and falling edges at TXO.
Philips Semiconductors
TIMING CHARACTERISTICS
V
NOTES:
FUNCTIONAL DESCRIPTION
The NE8392C contains four main functional blocks (see Block
Diagram). These are:
a. The receiver which takes data from the coaxial cable and sends
b. The transmitter which receives data from the DTE and sends it
c. The collision detection and heartbeat generation circuitry which
1995 May 1
EE
SYMBOL
SYMBOL
Coaxial transceiver interface for Ethernet/Thin Ethernet
inductance between 30 and 100 H at 5MHz.
–225mV, respectively.
it to the DTE.
onto the coaxial cable.
indicates to the DTE any collision on the coaxial cable and tests
t
t
t
t
t
t
= –9V +5%; T
t
COFF
t
t
TOFF
t
t
t
RON
RON
t
t
t
t
t
CON
f
HON
t
t
TST
t
t
t
t
TON
t
t
RHI
CHI
t
RM
HW
RD
RR
RF
OS
TD
TR
TM
CD
CP
RJ
TF
TS
JA
JR
Receiver start up delay RXI to RX (Figure 3)
First received bit on RX
First validly timed bit on RX
Receiver prop. delay RXI to RX
Differential output rise time on RX and CD
Differential output fall time on RX and CD
Differential output settling time on RX and CD
to V
Receiver and cable total jitter
Receiver high to idle time
Rise and fall time matching on RX and CD
Transmitter start–up delay TX to TXO
(Figure 5)
First transmitted bit on TXO
First validly timed bit
Transmitter prop delay TX to TXO
(see Figure 5)
Transmitter rise time 10% to 90% (see Figure 5)
Transmitter fall time 10% to 90% (see Figure 5)
t
Transmitter added skew
Transmitter turn on pulse width (see Figure 5)
Transmitter turn off pulse width (see Figure 5)
Collision turn on delay (see Figure 6)
Collision turn off delay (see Figure 6)
Collision high to idle time (see Figure 6)
Collision frequency (see Figure 6)
Collision signal pulse width (see Figure 6)
Heartbeat turn on delay (see Figure 7)
Heartbeat test duration (see Figure 7)
Jabber activation delay measured from TX to
CD (see Figure 8)
Jabber reset delay measured from TX to CD
(see Figure 8)
TF
A
= 0 to 70 C, unless otherwise specified
– t
OB
TR
EE
= 40mV
mismatch
= –9V and T
PARAMETER
PARAMETER
2
(see Figure 4)
A
4
= 27 C.
1
2,3
. No external isolation diode on TXO.
2,3
Measured to +210mV
0V to –2V step at RXI
–2V to 0V step at RXI
Measured to +210mV
TEST CONDITIONS
TEST CONDITIONS
V
V
V
V
V
V
V
TX
TX
RXI
RXI
5
TX
TX
TX
t
RF
= –2V peak
= –2V peak
= –1V peak
= –1V peak
d. The jabber timer which disables the transmitter in the event of a
Receiver Functions
The receiver consists of an input buffer, a cable equalizer, a 4-pole
Bessel low pass filter, a squelch circuit and a differential line driver.
The buffer provides high input resistance and low input capacitance
to minimize loading and reflections on the coaxial cable.
= 1V peak
= 1V peak
= 1V peak
– t
for collision circuitry functionality at the end of every
transmission.
longer than legal length data packet.
RR
MIN
150
150
150
250
8.0
0.6
0.5
10
35
20
LIMITS
TYP
250
0.4
35
25
25
10
35
5
5
1
1
3
2
2
t
t
RON
TST
MAX
12.5
Product specification
850
340
850
750
NE8392C
1.6
1.5
50
50
40
13
16
70
60
5
2
+ 2
+2
UNIT
UNIT
MHz
bits
bits
bits
bits
bits
bits
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
s
s
s