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PDF XRT4000 Data sheet ( Hoja de datos )
| Número de pieza | XRT4000 | |
| Descripción | Universal Multiprotocol Serial Interface | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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XRT4000
Universal Multiprotocol
Serial Interface
November 1998-2
FEATURES
• Software-configurable multiprotocol serial
interface supporting:
V.35, V.36, EIA-530 (A), RS232
(V.28), X.21, RS449
• One chip fully integrated solution (Internal
termination)
• Contains 8 receivers and 8 transmitters for full
DTE and DCE support
• Glitch filters on the control signals (Optional)
• +5V, +12V, -6V power supplies required
• Full support of loopbacks, data & clock inversion,
and echoed clock in DTE and DCE modes
• Full support of most popular types of HDLC
controllers (single, double, and triple clocks
supported)
• Internal oscillator for standalone DTE loopback
testing
• Control signals can be registered and non-
registered
• Control signals can be tri-stated for bus-based
designs
• “Fail Safe” operation supported
• ESD Protection Over + 2kV Range
APPLICATIONS
• Data Service Units (DSU)
• Routers
• Access Multiplexers
GENERAL DESCRIPTION
The XRT4000 is a fully integrated multiprotocol serial
interface. It is a universal device because it supports
all of the popular serial physical interfaces such as
V.35, V.36, EIA-530 (A), RS232 (V.28), X.21 and
RS449. Furthermore it can easily be interfaced with
most common types of HDLC controllers. This
device contains 8 receivers and 8 transmitters. It is
a complete solution containing all of the required
source and load terminations in one 100 pin TQFP
package.
XRT4000 can be configured to operate in one of the
seven interfaces in either DTE and DCE modes of
operation and power down mode. It fully supports
echoed clock as well as clock and data inversion. An
elaborate set of loopbacks are supported in DTE and
DCE modes of operation. This eliminates the need
for external circuitry for loopback implementation.
The control signals such as RI, RL, DCD, DTR, DSR
are protected against glitches by internal filters.
These filters can be disabled. XRT4000 has an
internal oscillator which is used to create a clock
signal needed to conduct standalone diagnostics of
DTE equipment.
ORDER INFORMATION
Part No.
XRT4000CV
Package
100 Pin TQFP
Operating
Temperature Range
0°C to +70°C
Rev. 1.00
EXAR Corporation, 48720 Kato Road, Fremont, CA 95538 ♦ (510) 668-7000 ♦ FAX (510) 668-7017
1 page  
PIN CONFIGURATION
XRT4000
VDD
GND
M0
M1
M2
EN_FLTR
EN_TERM
LATCH*
VSS
VSS
GND
CLKFS
TX4D
VDD
TX4B
TX4A
TX5A
TX5B
GND
TX5D
TX8D
LP*
TX8O
VSS
VDD
10
20
100-Pin
TQFP
XRT4000
TX1D
GND
VSS
VDD
VDD
70 GND
VSS
DTINV*
CKINV*
EN_OSC*
2CK/3CK*
REG_CLK
VR
VPP
NC
60 NC
NC
NC
VPP
VDD
E_232H*
VSS
N/C
GND
N/C
Rev. 1.00
-5-
5 Page 
XRT4000
ELECTRICAL CHARCTERISTICS (CONT’D)
Test Conditions: VDD = 5V, VSS = -6V, VPP = 12V (all ± 5%), TA = 25°C
Symbol Parameter
Min Typ Max Units Conditions
Logic Inputs and Outputs
VIH Logic Input High 2
Voltage
V
VIL Logic Input Low
Voltage
0.8 V
IIN Logic Input
Current
±250 µA With 20kΩ internal pull-up/down resistor
VOH Output High
Voltage
3 4.5
V IO = -4mA
VOL Output Low
Voltage
0.3 0.8
V IO = 4mA
IOSR Output Short-
Circuit Current
-60
60 mA 0V ≤ VO ≤ VDD
IOZR Three-State
Output Current
0 ±1
µA M0 = Ml = M2 = VDD 0V ≤ VO ≤ VDD
V.11 Driver
VOD Differential Output
5
Voltage
±2
V Open Circuit
RL = 50Ω (Figure 6)
∆VOD
Change in
Magnitude of
Differential Output
Voltage
0.2 V RL = 50Ω (Figure 6)
VOC Common Mode
Output Voltage
3.0 V RL = 50Ω (Figure 6)
∆VOC
Change in
Magnitude of
0.2 V RL = 50Ω (Figure 6)
Common Mode
Output Voltage
ISS Short-Circuit
Current
±150 mA VO = GND
IOZ Output Leakage
Current
±0.01 ±100
µA -0.25V ≤ VO ≤ 0.25V, Power Off or
Driver Disabled
tr, tf Rise or Fall Time 4 13 25 ns (Figures 7, 11)
TPLH Input to Output
50 70 110 ns (Figures 7, 11)
TPHL Input to Output
50 70 110 ns (Figures 7, 11)
∆t Inp. to Out.
0 5 15 ns (Figures 7, 11)
Difference, |TPLH
- TPHL|
TSKEW
Output to Output
Skew
5
ns (Figures 7, 11)
Note 1: Absolute Maximum Ratings are those beyond which the safety of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device are negative. All voltages are
referenced to device ground unless otherwise specified.
Rev. 1.00
- 11 -
11 Page | ||
| Páginas | Total 46 Páginas | |
| PDF Descargar | [ Datasheet XRT4000.PDF ] | |
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