These octal buffers and line drivers are designed to have the performance of the popular SN54LS240/SN74LS240 series and, at the same time, offer a pinout having the inputs and outputs on opposite sides of the package. This arrangement greatly enhances printed circuit board layout.
The three-state control gate is a 2-input NOR such that if either G1\ or G2\ are high, all eight outputs are in the high-impedance state.
The 'LS540 offers inverting data and the 'LS541 offers true data at the outputs.
The SN54LS540 and SN54LS541 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74LS540 and SN74LS541 are characterized for operation from 0°C to 70°C
| SN74LS540 | |
| Voltage Nodes(V) | 5 |
| Vcc range(V) | 4.75 to 5.25 |
| Input Level | TTL |
| Output Level | TTL |
| No. of Outputs | 8 |
| Output Drive(mA) | -15/24 |
| tpd max(ns) | 15 |
| Static Current | 35 |
| Logic | Inv |
| Technology Family | LS |
| Rating | Catalog |
| 器件 | 状态 | 温度 | 价格（美元） | 封装 | 引脚 | 封装数量 | 封装载体 | 丝印标记 |
| SN74LS540DBR | ACTIVE | 0 to 70 | 1.00 | 1ku | SSOP (DB) | 20 | ||
| SN74LS540DBRE4 | ACTIVE | 0 to 70 | 1.00 | 1ku | SSOP (DB) | 20 | ||
| SN74LS540DBRG4 | ACTIVE | 0 to 70 | 1.00 | 1ku | SSOP (DB) | 20 | ||
| SN74LS540DW | ACTIVE | 0 to 70 | 1.10 | 1ku | SOIC (DW) | 20 | ||
| SN74LS540DWE4 | ACTIVE | 0 to 70 | 1.10 | 1ku | SOIC (DW) | 20 | ||
| SN74LS540DWG4 | ACTIVE | 0 to 70 | 1.10 | 1ku | SOIC (DW) | 20 | ||
| SN74LS540DWR | ACTIVE | 0 to 70 | 0.90 | 1ku | SOIC (DW) | 20 | ||
| SN74LS540DWRE4 | ACTIVE | 0 to 70 | 0.90 | 1ku | SOIC (DW) | 20 | ||
| SN74LS540DWRG4 | ACTIVE | 0 to 70 | 0.90 | 1ku | SOIC (DW) | 20 | ||
| SN74LS540N | ACTIVE | 0 to 70 | 1.00 | 1ku | PDIP (N) | 20 | ||
| SN74LS540N3 | OBSOLETE | 0 to 70 | PDIP (N) | 20 | |||
| SN74LS540NE4 | ACTIVE | 0 to 70 | 1.00 | 1ku | PDIP (N) | 20 | ||
| SN74LS540NSR | ACTIVE | 0 to 70 | 1.00 | 1ku | SO (NS) | 20 | ||
| SN74LS540NSRE4 | ACTIVE | 0 to 70 | 1.00 | 1ku | SO (NS) | 20 | ||
| SN74LS540NSRG4 | ACTIVE | 0 to 70 | 1.00 | 1ku | SO (NS) | 20 |
| 器件 | 环保计划* | 铅/焊球涂层 | MSL 等级/回流焊峰 | 环保信息与无铅 (Pb-free) | DPPM / MTBF / FIT 率 |
| SN74LS540DBR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540DBR | SN74LS540DBR |
| SN74LS540DBRE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540DBRE4 | SN74LS540DBRE4 |
| SN74LS540DBRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540DBRG4 | SN74LS540DBRG4 |
| SN74LS540DW | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540DW | SN74LS540DW |
| SN74LS540DWE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540DWE4 | SN74LS540DWE4 |
| SN74LS540DWG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540DWG4 | SN74LS540DWG4 |
| SN74LS540DWR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540DWR | SN74LS540DWR |
| SN74LS540DWRE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540DWRE4 | SN74LS540DWRE4 |
| SN74LS540DWRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540DWRG4 | SN74LS540DWRG4 |
| SN74LS540N | Pb-Free (RoHS) | CU NIPDAU | N/A for Pkg Type | SN74LS540N | SN74LS540N |
| SN74LS540NE4 | Pb-Free (RoHS) | CU NIPDAU | N/A for Pkg Type | SN74LS540NE4 | SN74LS540NE4 |
| SN74LS540NSR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540NSR | SN74LS540NSR |
| SN74LS540NSRE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540NSRE4 | SN74LS540NSRE4 |
| SN74LS540NSRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS540NSRG4 | SN74LS540NSRG4 |