参数资料
型号: LC4256V-75T144I
厂商: Lattice Semiconductor Corporation
文件页数: 12/99页
文件大小: 0K
描述: IC PLD 256MC 96I/O 7.5NS 144TQFP
标准包装: 60
系列: ispMACH® 4000V
可编程类型: 系统内可编程
最大延迟时间 tpd(1): 7.5ns
电压电源 - 内部: 3 V ~ 3.6 V
逻辑元件/逻辑块数目: 16
宏单元数: 256
输入/输出数: 96
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 144-LQFP
供应商设备封装: 144-TQFP(20x20)
包装: 托盘
Lattice Semiconductor
ispMACH 4000V/B/C/Z Family Data Sheet
? LVTTL
? LVCMOS 3.3
? LVCMOS 1.8
? 3.3V PCI Compatible
? LVCMOS 2.5
All of the I/Os and dedicated inputs have the capability to provide a bus-keeper latch, Pull-up Resistor or Pull-down
Resistor. A fourth option is to provide none of these. The selection is done on a global basis. The default in both
hardware and software is such that when the device is erased or if the user does not specify, the input structure is
configured to be a Pull-up Resistor.
Each ispMACH 4000 device I/O has an individually programmable output slew rate control bit. Each output can be
individually configured for fast slew or slow slew. The typical edge rate difference between fast and slow slew set-
ting is 20%. For high-speed designs with long, unterminated traces, the slow-slew rate will introduce fewer reflec-
tions, less noise and keep ground bounce to a minimum. For designs with short traces or well terminated lines, the
fast slew rate can be used to achieve the highest speed.
Global OE Generation
Most ispMACH 4000 family devices have a 4-bit wide Global OE Bus, except the ispMACH 4032 device that has a
2-bit wide Global OE Bus. This bus is derived from a 4-bit internal global OE PT bus and two dual purpose I/O or
GOE pins. Each signal that drives the bus can optionally be inverted.
Each GLB has a block-level OE PT that connects to all bits of the Global OE PT bus with four fuses. Hence, for a
256-macrocell device (with 16 blocks), each line of the bus is driven from 16 OE product terms. Figures 9 and 10
show a graphical representation of the global OE generation.
Figure 9. Global OE Generation for All Devices Except ispMACH 4032
Internal Global OE
PT Bus
(4 lines)
Global OE
4-Bit
Global OE Bus
Shared PTOE
(Block 0)
Shared PTOE
(Block n)
Global
Fuses
GOE (0:3)
to I/O cells
Fuse connection
Hard wired
12
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