TI SN65ELT21：5V PECL转TTL接口接收器，低延迟与温度补偿特性
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TI-SN65ELT21是一款高性能的LVDS（Low-Voltage Differential Signaling）接收器，设计用于在5V PECL（Positive Edge Clocked Logic）信号与TTL（Transistor-Transistor Logic）之间进行数据传输转换。该器件的主要特点包括：
1. **快速传输性能**：SN65ELT21具有典型的3纳秒（TYP）传播延迟时间，确保了数据在不同接口间的高效传输。
2. **宽工作电压范围**：它能在4.2伏特至5.7伏特的电源电压范围内正常工作，且兼容D或DG封装，同时地（GND）保持在0伏特。
3. **确定性的输出特性**：当输入信号为开路或低于1.3伏特时，输出值是可预测的，这有助于提高系统的可靠性。
4. **温度补偿功能**：内置温度补偿电路使得设备在不同环境温度下仍能维持稳定的工作性能。
5. **轻松替换性**：SN65ELT21与MC10ELT21和MC100ELT21等同类产品兼容，可以作为drop-in解决方案方便替换现有应用中的接口组件。
6. **多用途接口**：支持数据和时钟信号通过背板进行传输，适应于需要长距离或复杂布线结构的应用场景。
7. **信号电平转换**：无论是数据还是时钟信号，都能实现LVDS到TTL的电平转换，便于集成到各种不同的系统架构中。
8. **清晰的引脚分配**：表1列出了详细的引脚功能，如VCC（正电源）、VEE（负电源）、VBB（参考电压输出）等，有助于用户理解和安装。
9. **单端模式使用**：当在单端模式下工作时，未使用的输入应连接到VBB，以提供额外的电源或输入偏置。
TI-SN65ELT21是一款设计精良、性能稳定的LVDS接收器，适用于需要将高速PECL信号转化为TTL信号的多种应用场景，如计算机主板、通信设备或工业控制系统的信号处理。其紧凑的封装和丰富的特性使其成为现代电子系统设计中不可或缺的组件。
PECL DC CHARACTERISTICS
TTL DC CHARACTERISTICS
AC CHARACTERISTICS
SN65ELT21
www.ti.com
....................................................................................................................................................................................................... SLLS923 – JUNE 2009
At V
CC
= 5.0 V, GND = 0.0 V (unless otherwise noted)
(1) (2)
T
A
= – 40 ° C T
A
= 25 ° C T
A
= 85 ° C
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX MIN TYP MAX
V
IH
High-level input voltage, 3835 4120 3835 4120 3835 4120 mV
single-ended
V
IL
Low-leveI input voltage, 3190 3525 3190 3525 3190 3525 mV
single-ended
V
BB
Output reference voltage 3.62 3.69 3.74 3.62 3.69 3.74 3.62 3.69 3.74 V
V
IHCMR
High-level input voltage, See
(3)
2.2 5.0 2.2 5.0 2.2 5.0 V
common-mode range,
differential
I
IH
High-level input current 150 150 150 µ A
I
IL
Low-level input current 0.5 0.5 0.5 µ A
(1) The device will meet the specifications after thermal balance has been established when mounted in a socket or printed circuit board
with maintained transverse airflow greater than 500 lfpm. Electrical parameters are assured only over the declared operating
temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are
applied individually under normal operating conditions and not valid simultaneously.
(2) Input parameters vary 1:1 with V
CC
. V
CC
can vary +0.7 V / – 0.8 V.
(3) V
IHCMR(min)
varies 1:1 with GND, V
IHCMR(max)
varies 1:1 with V
CC
.
At V
CC
= 4.2 V to 5.7 V, T
A
= – 40 ° C to 85 ° C (unless otherwise noted)
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
CCH
Power supply current 20 mA
I
CCL
Power supply current 20 mA
V
OH
High-level output voltage I
OH
= – 3.0 mA 2.4 See
(2)
V
V
OL
Low-level output voltage I
OL
= 24 mA 0.5 V
I
OS
Output short circuit current – 150 – 60 mA
(1) The device will meet the specifications after thermal balance has been established when mounted in a socket or printed circuit board
with maintained transverse airflow greater than 500 lfpm. Electrical parameters are assured only over the declared operating
temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are
applied individually under normal operating conditions and not valid simultaneously.
(2) V
OH(max) level
is V
CC
– 0.7.
At V
CC
= 4.2 V to 5.7 V, GND = 0.0 V (unless otherwise noted)
(1) (2)
T
A
= – 40 ° C T
A
= 25 ° C T
A
= 85 ° C
TEST
PARAMETER UNIT
CONDITIONS
MIN TYP MAX MIN TYP MAX MIN TYP MAX
f
MAX
Maximum switching At Vol < 0.5V 200 200 200 MHz
frequency (See Figure 4)
t
PLH
/t
PHL
Propagation delay times At 1.5 V 2 4.5 2 4.5 2 4.5 ns
t
JITTER
Random clock jitter (RMS) 5 20 5 20 5 20 ps
V
PP
Input swing See
(3)
200 1000 200 1000 200 1000 mV
t
r
/t
f
Output rise/fall times Q (10% – 90%) 750 780 910 ps
(1) The device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit
board with maintained transverse airflow greater than 500 lfpm. Electrical parameters are assured only over the declared operating
temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are
applied individually under normal operating conditions and not valid simultaneously.
(2) R
L
= 500 Ω to GND and C
L
= 20 pF to GND. See Figure 1 .
(3) V
PP(min)
is minimum input swing for which ac parameters are assured.
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): SN65ELT21
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