- 您现在的位置：买卖IC网 > PDF目录8287 > 74LCXH16374MEAX (Fairchild Semiconductor)IC FLIP FLOP 16BIT D LV 48SSOP PDF资料下载
参数资料
| 型号： | 74LCXH16374MEAX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 3/10页 |
| 文件大小： | 0K |
| 描述： | IC FLIP FLOP 16BIT D LV 48SSOP |
| 产品变化通告： | Die Material/Mold Compound Change 10/Sept/2008 |
| 标准包装： | 1,000 |
| 系列： | 74LCXH |
| 功能： | 标准 |
| 类型： | D 型总线 |
| 输出类型： | 三态非反相 |
| 元件数： | 2 |
| 每个元件的位元数： | 8 |
| 频率 - 时钟： | 170MHz |
| 延迟时间 - 传输： | 6.2ns |
| 触发器类型： | 正边沿 |
| 输出电流高，低： | 24mA，24mA |
| 电源电压： | 2 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-BSSOP（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
1998 Jul 08
2
Philips Semiconductors
Product specication
Programmable divide-by-n counter
74HC/HCT4059
FEATURES
Synchronous programmable divide-by-n counter
Presettable down counter
Fully static operation
Mode select control of initial decade counting function
(divide-by-10, 8, 5, 4 and 2)
Master preset initialization
Latchable output
Easily cascadable with other counters
Four operating modes:
timer
divider-by-n
divide-by-10 000
master preset
Output capability: standard
ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT4059 are high-speed Si-gate CMOS
devices and are pin compatible with the “4059” of the
“4000B” series. They are specified in compliance with
JEDEC standard no. 7A.
The 74HC/HCT4059 are divide-by-n counters which can
be programmed to divide an input frequency by any
number (n) from 3 to 15 999. There are four operating
modes, timer, divide-by-n, divide-by-10 000 and master
preset, which are defined by the mode select inputs (Ka to
Kc) and the latch enable input (LE) as shown in the
Function table.
The complete counter consists of a first counting stage, an
intermediate counting stage and a fifth counting stage. The
first counter stage consists of four independent flip-flops.
Depending on the divide-by-mode, at least one flip-flop is
placed at the input of the intermediate stage (the remaining
flip-flops are placed at the fifth stage with a place value of
thousands). The intermediate stage consists of three
cascaded decade counters, each containing four flip-flops.
All flip-flops can be preset to a desired state by means of
the JAM inputs (J1 to J16), during which the clock input
(CP) will cause all stages to count from n to zero. The
zero-detect circuit will then cause all stages to return to the
JAM count, during which an output pulse is generated. In
the timer mode, after an output pulse is generated, the
output pulse remains HIGH until the latch input (LE) goes
LOW. The counter will advance, even if LE is HIGH and
the output is latched in the HIGH state.
In the divide-by-n mode, a clock cycle wide pulse is
generated with a frequency rate equal to the input
frequency divided by n.
The function of the mode select and JAM inputs are
illustrated in the following examples. In the divide-by-2
mode, only one flip-flop is needed in the first counting
section. Therefore the last (5th) counting section has three
flip-flops that can be preset to a maximum count of seven
with a place value of thousands. This counting mode is
selected when Ka to Kc are set HIGH. In this case input J1
is used to preset the first counting section and J2 to J4 are
used to preset the last (5th) counting section.
If the divide-by-10 mode is desired for the first section, Ka
and Kb are set HIGH and Kc is set LOW. The JAM inputs
J1 to J4 are used to preset the first counting section (there
is no last counting section). The intermediate counting
section consists of three cascaded BCD decade
(divide-by-10) counters, presettable by means of the JAM
inputs J5 to J16.
The preset of the counter to a desired divide-by-n is
achieved as follows:
n = (MODE(1)) (1 000 x decade 5 preset
+ 100 x decade 4 preset
+ 10 x decade 3 preset
+ 1 x decade 2 preset)
+ decade 1 preset
To calculate preset values for any “n” count, divide the “n”
count by the selected mode. The resultant is the
corresponding preset value of the 5th to the 2nd decade
with the remainder being equal to the 1st decade value;
preset value = n/mode.
If n = 8 479, and the selected mode = 5, the preset
value = 8 479/5 = 1 695 with a remainder of 4, thus the
JAM inputs must be set as shown in Table 1.
To verify the results, use the given equation:
n = 5 (1 000
× 1 + 100 × 6 + 10 × 9 + 1 × 5) + 4
n = 8 479.
If n = 12 382 and the selected mode = 8, the preset
value = 12 382/8 = 1 547 with a remainder of 6, thus the
JAM inputs must be set as shown in Table 2.
To verify:
n = 8 (1 000
× 1 + 100 × 5 + 10 × 4 + 1 × 7) + 6
n = 12 382.
(1)
MODE = first counting section divider
(10, 8, 5, 4 or 2).
相关PDF资料 |
PDF描述 |
|---|---|
| RCD-24-0.60/W/VREF | LED DRIVER CONST .6A 2-35VOUT |
| 74LCXH16374MEA | IC FLIP FLOP 16BIT D LV 48SSOP |
| 74LCX821WM | IC FLIP FLOP 10BIT D LV 24SOIC |
| 1776038-5 | TERM BLOCK HEADER R/A 5POS |
| 284517-8 | TERM BLOCK HDR 8POS STR 3.81MM |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 74LCXH16374MTD | 功能描述:触发器 16-Bit Flip-Flop D-Type/Bushold RoHS:否 制造商:Texas Instruments 电路数量:2 逻辑系列:SN74 逻辑类型:D-Type Flip-Flop 极性:Inverting, Non-Inverting 输入类型:CMOS 输出类型: 传播延迟时间:4.4 ns 高电平输出电流:- 16 mA 低电平输出电流:16 mA 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:X2SON-8 封装:Reel |
| 74LCXH16374MTD_Q | 功能描述:触发器 16-Bit Flip-Flop D-Type/Bushold RoHS:否 制造商:Texas Instruments 电路数量:2 逻辑系列:SN74 逻辑类型:D-Type Flip-Flop 极性:Inverting, Non-Inverting 输入类型:CMOS 输出类型: 传播延迟时间:4.4 ns 高电平输出电流:- 16 mA 低电平输出电流:16 mA 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:X2SON-8 封装:Reel |
| 74LCXH16374MTDX | 功能描述:触发器 D-Type Flip Flop LV 16Bit RoHS:否 制造商:Texas Instruments 电路数量:2 逻辑系列:SN74 逻辑类型:D-Type Flip-Flop 极性:Inverting, Non-Inverting 输入类型:CMOS 输出类型: 传播延迟时间:4.4 ns 高电平输出电流:- 16 mA 低电平输出电流:16 mA 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:X2SON-8 封装:Reel |
| 74LCXH2245MSA | 功能描述:总线收发器 Transceiver Bidirectional RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| 74LCXH2245MSA_Q | 功能描述:总线收发器 Transceiver Bidirectional RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。