參數(shù)資料
型號: GCIXP1250-232
英文描述: Microprocessor
中文描述: 微處理器
文件頁數(shù): 71/148頁
文件大?。?/td> 1601K
代理商: GCIXP1250-232
Intel
IXP1250 Network Processor
Datasheet
71
4.2
DC Specifications
The IXP1250 supports two fundamental I/O buffer Types: Type 1 and Type 2. The Pin Description
section defines which pins use which I/O buffer type. The driver characteristics are described in the
following sections. Please note that IXP1250 input pins are not 5 V tolerant. Devices driving the
IXP1250 must provide 3.3 V signal levels or use level shifting buffers to provide 3.3 V compatible
levels, otherwise damage to the device will result.
The Type 1 pins are 3.3 V Low Voltage TTL compatible I/O buffers. There are three versions of the
Type 1 driver that differ by the maximum available driver current.
The Type 2 pins are 3.3 V I/O buffers (supporting
PCI Local Bus Specification, Revision 2.2
).
4.2.1
Type 1 Driver DC Specifications
Table 35
refers to pin types: I1, O1, O3, O4, O5.
Table 35. I1, I3, O1, O3, O4, and O5 Pin Types
Symbol
Parameter
Condition
Minimum
Maximum
V
ih
Input High Voltage
2.0 V
---
V
il
Input Low Voltage
---
0.8 V
V
oh
Output High
Voltage
O1: Ioh = -2 mA
O3: Ioh = -8 mA
O4: Ioh = -4 mA
O5: Ioh = -4 mA
2.4 V
-
V
ol
Output Low Voltage
O1: Iol = 2 mA
O3: Iol = 8 mA
O4: Iol = 4 mA
O5: Iol = 4 mA
---
0.4 V
I
i
Input Leakage
Current
1. Input leakage currents include high impedance output leakage for all bidirectional buffers with tri-state outputs.
0
Vin
VDDX
-10
μ
A
10
μ
A
C
in
Pin Capacitance
-
4 pF
10 pF
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